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Made base::lambda a copyable value type.

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Now base::lambda can be copied and can wrap any immutable lambda.
For mutable lambdas there is base::lambda_once (which you're
supposed to call only once to pass data through lambda captures,
for example by using std::unique_ptr). Generally base::lambda is
passed by value and base::lambda_once is passed by rvalue reference.
This commit is contained in:
John Preston
2017-02-26 14:32:13 +03:00
parent f82989c9c3
commit c207743338
78 changed files with 662 additions and 633 deletions
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2
Telegram/SourceFiles/core/click_handler.h
View File

@@ -180,7 +180,7 @@ protected:
class LambdaClickHandler : public ClickHandler {
public:
LambdaClickHandler(base::lambda<void()> &&handler) : _handler(std::move(handler)) {
LambdaClickHandler(base::lambda<void()> handler) : _handler(std::move(handler)) {
}
void onClick(Qt::MouseButton button) const override final {
if (button == Qt::LeftButton && _handler) {

856
Telegram/SourceFiles/core/lambda.h
View File

@@ -23,415 +23,454 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
#include <memory>
namespace base {
namespace internal {
template <typename Return, typename ...Args>
struct lambda_wrap_helper_base {
using construct_copy_other_type = void(*)(void *, const void *); // dst, src
using construct_move_other_type = void(*)(void *, void *); // dst, src
using call_type = Return(*)(const void *, Args...);
using destruct_type = void(*)(const void *);
lambda_wrap_helper_base() = delete;
lambda_wrap_helper_base(const lambda_wrap_helper_base &other) = delete;
lambda_wrap_helper_base &operator=(const lambda_wrap_helper_base &other) = delete;
lambda_wrap_helper_base(
construct_copy_other_type construct_copy_other,
construct_move_other_type construct_move_other,
call_type call,
destruct_type destruct)
: construct_copy_other(construct_copy_other)
, construct_move_other(construct_move_other)
, call(call)
, destruct(destruct) {
}
const construct_copy_other_type construct_copy_other;
const construct_move_other_type construct_move_other;
const call_type call;
const destruct_type destruct;
static constexpr size_t kFullStorageSize = 24U + sizeof(void*);
static constexpr size_t kStorageSize = kFullStorageSize - sizeof(void*);
using alignment = uint64;
template <typename Lambda>
using IsLarge = std::integral_constant<bool, !(sizeof(std::decay_t<Lambda>) <= kStorageSize)>;
protected:
static void bad_construct_copy(void *lambda, const void *source) {
t_assert(!"base::lambda bad_construct_copy() called!");
}
};
template <typename Return, typename ...Args>
struct lambda_wrap_empty : public lambda_wrap_helper_base<Return, Args...> {
static void construct_copy_other_method(void *lambda, const void *source) {
}
static void construct_move_other_method(void *lambda, void *source) {
}
static Return call_method(const void *lambda, Args... args) {
t_assert(!"base::lambda empty call_method() called!");
return Return();
}
static void destruct_method(const void *lambda) {
}
lambda_wrap_empty() : lambda_wrap_helper_base<Return, Args...>(
&lambda_wrap_empty::construct_copy_other_method,
&lambda_wrap_empty::construct_move_other_method,
&lambda_wrap_empty::call_method,
&lambda_wrap_empty::destruct_method) {
}
static const lambda_wrap_empty<Return, Args...> instance;
};
template <typename Return, typename ...Args>
const lambda_wrap_empty<Return, Args...> lambda_wrap_empty<Return, Args...>::instance = {};
template <typename Lambda, typename IsLarge, typename Return, typename ...Args> struct lambda_wrap_helper_move_impl;
template <typename Lambda, typename Return, typename ...Args>
struct lambda_wrap_helper_move_impl<Lambda, std::true_type, Return, Args...> : public lambda_wrap_helper_base<Return, Args...> {
using JustLambda = std::decay_t<Lambda>;
using LambdaPtr = std::unique_ptr<JustLambda>;
using Parent = lambda_wrap_helper_base<Return, Args...>;
static void construct_move_other_method(void *lambda, void *source) {
auto source_lambda = static_cast<LambdaPtr*>(source);
new (lambda) LambdaPtr(std::move(*source_lambda));
}
static void construct_move_lambda_method(void *lambda, void *source) {
auto source_lambda = static_cast<JustLambda*>(source);
new (lambda) LambdaPtr(std::make_unique<JustLambda>(static_cast<JustLambda&&>(*source_lambda)));
}
static Return call_method(const void *lambda, Args... args) {
return (**static_cast<const LambdaPtr*>(lambda))(std::forward<Args>(args)...);
}
static void destruct_method(const void *lambda) {
static_cast<const LambdaPtr*>(lambda)->~LambdaPtr();
}
lambda_wrap_helper_move_impl() : Parent(
&Parent::bad_construct_copy,
&lambda_wrap_helper_move_impl::construct_move_other_method,
&lambda_wrap_helper_move_impl::call_method,
&lambda_wrap_helper_move_impl::destruct_method) {
}
protected:
lambda_wrap_helper_move_impl(
typename Parent::construct_copy_other_type construct_copy_other
) : Parent(
construct_copy_other,
&lambda_wrap_helper_move_impl::construct_move_other_method,
&lambda_wrap_helper_move_impl::call_method,
&lambda_wrap_helper_move_impl::destruct_method) {
}
};
template <typename Lambda, typename Return, typename ...Args>
struct lambda_wrap_helper_move_impl<Lambda, std::false_type, Return, Args...> : public lambda_wrap_helper_base<Return, Args...> {
using JustLambda = std::decay_t<Lambda>;
using Parent = lambda_wrap_helper_base<Return, Args...>;
static void construct_move_other_method(void *lambda, void *source) {
auto source_lambda = static_cast<JustLambda*>(source);
new (lambda) JustLambda(static_cast<JustLambda&&>(*source_lambda));
}
static void construct_move_lambda_method(void *lambda, void *source) {
static_assert(alignof(JustLambda) <= alignof(typename Parent::alignment), "Bad lambda alignment.");
auto space = sizeof(JustLambda);
auto aligned = std::align(alignof(JustLambda), space, lambda, space);
t_assert(aligned == lambda);
auto source_lambda = static_cast<JustLambda*>(source);
new (lambda) JustLambda(static_cast<JustLambda&&>(*source_lambda));
}
static Return call_method(const void *lambda, Args... args) {
return (*static_cast<const JustLambda*>(lambda))(std::forward<Args>(args)...);
}
static void destruct_method(const void *lambda) {
static_cast<const JustLambda*>(lambda)->~JustLambda();
}
lambda_wrap_helper_move_impl() : Parent(
&Parent::bad_construct_copy,
&lambda_wrap_helper_move_impl::construct_move_other_method,
&lambda_wrap_helper_move_impl::call_method,
&lambda_wrap_helper_move_impl::destruct_method) {
}
protected:
lambda_wrap_helper_move_impl(
typename Parent::construct_copy_other_type construct_copy_other
) : Parent(
construct_copy_other,
&lambda_wrap_helper_move_impl::construct_move_other_method,
&lambda_wrap_helper_move_impl::call_method,
&lambda_wrap_helper_move_impl::destruct_method) {
}
};
template <typename Lambda, typename Return, typename ...Args>
struct lambda_wrap_helper_move : public lambda_wrap_helper_move_impl<Lambda
, typename lambda_wrap_helper_base<Return, Args...>::template IsLarge<Lambda>
, Return, Args...> {
static const lambda_wrap_helper_move instance;
};
template <typename Lambda, typename Return, typename ...Args>
const lambda_wrap_helper_move<Lambda, Return, Args...> lambda_wrap_helper_move<Lambda, Return, Args...>::instance = {};
template <typename Lambda, typename IsLarge, typename Return, typename ...Args> struct lambda_wrap_helper_copy_impl;
template <typename Lambda, typename Return, typename ...Args>
struct lambda_wrap_helper_copy_impl<Lambda, std::true_type, Return, Args...> : public lambda_wrap_helper_move_impl<Lambda, std::true_type, Return, Args...> {
using JustLambda = std::decay_t<Lambda>;
using LambdaPtr = std::unique_ptr<JustLambda>;
using Parent = lambda_wrap_helper_move_impl<Lambda, std::true_type, Return, Args...>;
static void construct_copy_other_method(void *lambda, const void *source) {
auto source_lambda = static_cast<const LambdaPtr*>(source);
new (lambda) LambdaPtr(std::make_unique<JustLambda>(*source_lambda->get()));
}
static void construct_copy_lambda_method(void *lambda, const void *source) {
auto source_lambda = static_cast<const JustLambda*>(source);
new (lambda) LambdaPtr(std::make_unique<JustLambda>(static_cast<const JustLambda &>(*source_lambda)));
}
lambda_wrap_helper_copy_impl() : Parent(&lambda_wrap_helper_copy_impl::construct_copy_other_method) {
}
};
template <typename Lambda, typename Return, typename ...Args>
struct lambda_wrap_helper_copy_impl<Lambda, std::false_type, Return, Args...> : public lambda_wrap_helper_move_impl<Lambda, std::false_type, Return, Args...> {
using JustLambda = std::decay_t<Lambda>;
using Parent = lambda_wrap_helper_move_impl<Lambda, std::false_type, Return, Args...>;
static void construct_copy_other_method(void *lambda, const void *source) {
auto source_lambda = static_cast<const JustLambda*>(source);
new (lambda) JustLambda(static_cast<const JustLambda &>(*source_lambda));
}
static void construct_copy_lambda_method(void *lambda, const void *source) {
static_assert(alignof(JustLambda) <= alignof(typename Parent::alignment), "Bad lambda alignment.");
auto space = sizeof(JustLambda);
auto aligned = std::align(alignof(JustLambda), space, lambda, space);
t_assert(aligned == lambda);
auto source_lambda = static_cast<const JustLambda*>(source);
new (lambda) JustLambda(static_cast<const JustLambda &>(*source_lambda));
}
lambda_wrap_helper_copy_impl() : Parent(&lambda_wrap_helper_copy_impl::construct_copy_other_method) {
}
};
template <typename Lambda, typename Return, typename ...Args>
struct lambda_wrap_helper_copy : public lambda_wrap_helper_copy_impl<Lambda
, typename lambda_wrap_helper_base<Return, Args...>::template IsLarge<Lambda>
, Return, Args...> {
static const lambda_wrap_helper_copy instance;
};
template <typename Lambda, typename Return, typename ...Args>
const lambda_wrap_helper_copy<Lambda, Return, Args...> lambda_wrap_helper_copy<Lambda, Return, Args...>::instance = {};
} // namespace internal
template <typename Function> class lambda_once;
template <typename Function> class lambda;
template <typename Function> class lambda_copy;
template <typename Return, typename ...Args>
class lambda<Return(Args...)> {
using BaseHelper = internal::lambda_wrap_helper_base<Return, Args...>;
using EmptyHelper = internal::lambda_wrap_empty<Return, Args...>;
template <typename Lambda>
using IsUnique = std::is_same<lambda, std::decay_t<Lambda>>;
template <typename Lambda>
using IsWrap = std::is_same<lambda_copy<Return(Args...)>, std::decay_t<Lambda>>;
template <typename Lambda>
using IsOther = std::enable_if_t<!IsUnique<Lambda>::value && !IsWrap<Lambda>::value>;
template <typename Lambda>
using IsRvalue = std::enable_if_t<std::is_rvalue_reference<Lambda&&>::value>;
public:
using return_type = Return;
lambda() : helper_(&EmptyHelper::instance) {
}
lambda(const lambda &other) = delete;
lambda &operator=(const lambda &other) = delete;
lambda(lambda &&other) : helper_(other.helper_) {
helper_->construct_move_other(storage_, other.storage_);
}
lambda &operator=(lambda &&other) {
auto temp = std::move(other);
helper_->destruct(storage_);
helper_ = temp.helper_;
helper_->construct_move_other(storage_, temp.storage_);
return *this;
}
void swap(lambda &other) {
if (this != &other) std::swap(*this, other);
}
template <typename Lambda, typename = IsOther<Lambda>, typename = IsRvalue<Lambda>>
lambda(Lambda &&other) : helper_(&internal::lambda_wrap_helper_move<Lambda, Return, Args...>::instance) {
internal::lambda_wrap_helper_move<Lambda, Return, Args...>::construct_move_lambda_method(storage_, &other);
}
template <typename Lambda, typename = IsOther<Lambda>, typename = IsRvalue<Lambda>>
lambda &operator=(Lambda &&other) {
auto temp = std::move(other);
helper_->destruct(storage_);
helper_ = &internal::lambda_wrap_helper_move<Lambda, Return, Args...>::instance;
internal::lambda_wrap_helper_move<Lambda, Return, Args...>::construct_move_lambda_method(storage_, &temp);
return *this;
}
inline Return operator()(Args... args) const {
return helper_->call(storage_, std::forward<Args>(args)...);
}
explicit operator bool() const {
return (helper_ != &EmptyHelper::instance);
}
~lambda() {
helper_->destruct(storage_);
}
protected:
struct Private {
};
lambda(const BaseHelper *helper, const Private &) : helper_(helper) {
}
using alignment = typename BaseHelper::alignment;
static_assert(BaseHelper::kStorageSize % sizeof(alignment) == 0, "Bad storage size.");
alignas(typename BaseHelper::alignment) alignment storage_[BaseHelper::kStorageSize / sizeof(alignment)];
const BaseHelper *helper_;
};
template <typename Return, typename ...Args>
class lambda_copy<Return(Args...)> : public lambda<Return(Args...)> {
using BaseHelper = internal::lambda_wrap_helper_base<Return, Args...>;
using Parent = lambda<Return(Args...)>;
template <typename Lambda>
using IsOther = std::enable_if_t<!std::is_same<lambda_copy, std::decay_t<Lambda>>::value>;
template <typename Lambda>
using IsRvalue = std::enable_if_t<std::is_rvalue_reference<Lambda&&>::value>;
template <typename Lambda>
using IsNotRvalue = std::enable_if_t<!std::is_rvalue_reference<Lambda&&>::value>;
public:
lambda_copy() = default;
lambda_copy(const lambda_copy &other) : Parent(other.helper_, typename Parent::Private()) {
this->helper_->construct_copy_other(this->storage_, other.storage_);
}
lambda_copy &operator=(const lambda_copy &other) {
auto temp = other;
temp.swap(*this);
return *this;
}
lambda_copy(lambda_copy &&other) = default;
lambda_copy &operator=(lambda_copy &&other) = default;
void swap(lambda_copy &other) {
if (this != &other) std::swap(*this, other);
}
lambda_copy clone() const {
return *this;
}
template <typename Lambda, typename = IsOther<Lambda>>
lambda_copy(const Lambda &other) : Parent(&internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::instance, typename Parent::Private()) {
internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::construct_copy_lambda_method(this->storage_, &other);
}
template <typename Lambda, typename = IsOther<Lambda>, typename = IsRvalue<Lambda>>
lambda_copy(Lambda &&other) : Parent(&internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::instance, typename Parent::Private()) {
internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::construct_move_lambda_method(this->storage_, &other);
}
template <typename Lambda, typename = IsOther<Lambda>>
lambda_copy &operator=(const Lambda &other) {
auto temp = other;
this->helper_->destruct(this->storage_);
this->helper_ = &internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::instance;
internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::construct_copy_lambda_method(this->storage_, &other);
return *this;
}
template <typename Lambda, typename = IsOther<Lambda>, typename = IsRvalue<Lambda>>
lambda_copy &operator=(Lambda &&other) {
auto temp = std::move(other);
this->helper_->destruct(this->storage_);
this->helper_ = &internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::instance;
internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::construct_move_lambda_method(this->storage_, &other);
return *this;
}
};
// Get lambda type from a lambda template parameter.
namespace internal {
namespace lambda_internal {
template <typename FunctionType>
struct lambda_type_resolver;
struct type_resolver;
template <typename Lambda, typename R, typename ...Args>
struct lambda_type_resolver<R(Lambda::*)(Args...) const> {
struct type_resolver<R(Lambda::*)(Args...) const> {
using type = lambda<R(Args...)>;
static constexpr auto is_mutable = false;
};
template <typename Lambda, typename R, typename ...Args>
struct lambda_type_resolver<R(Lambda::*)(Args...)> {
struct type_resolver<R(Lambda::*)(Args...)> {
using type = lambda<R(Args...)>;
static constexpr auto is_mutable = true;
};
template <typename FunctionType>
struct lambda_type_helper {
using type = typename lambda_type_resolver<decltype(&FunctionType::operator())>::type;
template <typename Lambda>
struct type_helper {
using type = typename type_resolver<decltype(&Lambda::operator())>::type;
static constexpr auto is_mutable = type_resolver<decltype(&Lambda::operator())>::is_mutable;
};
} // namespace internal
} // namespace lambda_internal
template <typename FunctionType>
using lambda_type = typename internal::lambda_type_helper<FunctionType>::type;
template <typename Lambda>
using lambda_type = typename lambda_internal::type_helper<std::decay_t<Lambda>>::type;
template <typename Lambda>
constexpr bool lambda_is_mutable = lambda_internal::type_helper<std::decay_t<Lambda>>::is_mutable;
namespace lambda_internal {
constexpr auto kFullStorageSize = 32U;
static_assert(kFullStorageSize % sizeof(void*) == 0, "Invalid pointer size!");
constexpr auto kStorageSize = kFullStorageSize - sizeof(void*);
using alignment = std::max_align_t;
template <typename Lambda>
constexpr bool is_large = (sizeof(std::decay_t<Lambda>) > kStorageSize);
inline void bad_construct_copy(void *lambda, const void *source) {
t_assert(!"base::lambda bad_construct_copy() called!");
}
template <typename Return, typename ...Args>
Return bad_const_call(const void *lambda, Args...) {
t_assert(!"base::lambda bad_const_call() called!");
return Return();
}
template <typename Return, typename ...Args>
struct vtable_base {
using construct_copy_other_type = void(*)(void *, const void *); // dst, src
using construct_move_other_type = void(*)(void *, void *); // dst, src
using const_call_type = Return(*)(const void *, Args...);
using call_type = Return(*)(void *, Args...);
using destruct_type = void(*)(const void *);
vtable_base() = delete;
vtable_base(const vtable_base &other) = delete;
vtable_base &operator=(const vtable_base &other) = delete;
vtable_base(
construct_copy_other_type construct_copy_other,
construct_move_other_type construct_move_other,
const_call_type const_call,
call_type call,
destruct_type destruct)
: construct_copy_other(construct_copy_other)
, construct_move_other(construct_move_other)
, const_call(const_call)
, call(call)
, destruct(destruct) {
}
const construct_copy_other_type construct_copy_other;
const construct_move_other_type construct_move_other;
const const_call_type const_call;
const call_type call;
const destruct_type destruct;
};
template <typename Lambda, bool IsLarge, typename Return, typename ...Args> struct vtable_once_impl;
template <typename Lambda, typename Return, typename ...Args>
struct vtable_once_impl<Lambda, true, Return, Args...> : public vtable_base<Return, Args...> {
using JustLambda = std::decay_t<Lambda>;
using LambdaPtr = std::unique_ptr<JustLambda>;
using Parent = vtable_base<Return, Args...>;
static void construct_move_other_method(void *storage, void *source) {
auto source_lambda_ptr = static_cast<LambdaPtr*>(source);
new (storage) LambdaPtr(std::move(*source_lambda_ptr));
}
static Return call_method(void *storage, Args... args) {
return (**static_cast<LambdaPtr*>(storage))(std::forward<Args>(args)...);
}
static void destruct_method(const void *storage) {
static_cast<const LambdaPtr*>(storage)->~LambdaPtr();
}
vtable_once_impl() : Parent(
&bad_construct_copy,
&vtable_once_impl::construct_move_other_method,
&bad_const_call<Return, Args...>,
&vtable_once_impl::call_method,
&vtable_once_impl::destruct_method) {
}
// Used directly.
static void construct_move_lambda_method(void *storage, void *source) {
auto source_lambda = static_cast<JustLambda*>(source);
new (storage) LambdaPtr(std::make_unique<JustLambda>(static_cast<JustLambda&&>(*source_lambda)));
}
protected:
vtable_once_impl(
typename Parent::construct_copy_other_type construct_copy_other,
typename Parent::const_call_type const_call
) : Parent(
construct_copy_other,
&vtable_once_impl::construct_move_other_method,
const_call,
&vtable_once_impl::call_method,
&vtable_once_impl::destruct_method) {
}
};
template <typename Lambda, typename Return, typename ...Args>
struct vtable_once_impl<Lambda, false, Return, Args...> : public vtable_base<Return, Args...> {
using JustLambda = std::decay_t<Lambda>;
using Parent = vtable_base<Return, Args...>;
static void construct_move_other_method(void *storage, void *source) {
auto source_lambda = static_cast<JustLambda*>(source);
new (storage) JustLambda(static_cast<JustLambda&&>(*source_lambda));
}
static Return call_method(void *storage, Args... args) {
return (*static_cast<JustLambda*>(storage))(std::forward<Args>(args)...);
}
static void destruct_method(const void *storage) {
static_cast<const JustLambda*>(storage)->~JustLambda();
}
vtable_once_impl() : Parent(
&bad_construct_copy,
&vtable_once_impl::construct_move_other_method,
&bad_const_call<Args...>,
&vtable_once_impl::call_method,
&vtable_once_impl::destruct_method) {
}
// Used directly.
static void construct_move_lambda_method(void *storage, void *source) {
auto source_lambda = static_cast<JustLambda*>(source);
new (storage) JustLambda(static_cast<JustLambda&&>(*source_lambda));
}
protected:
vtable_once_impl(
typename Parent::construct_copy_other_type construct_copy_other,
typename Parent::const_call_type const_call
) : Parent(
construct_copy_other,
&vtable_once_impl::construct_move_other_method,
const_call,
&vtable_once_impl::call_method,
&vtable_once_impl::destruct_method) {
}
};
template <typename Lambda, typename Return, typename ...Args>
struct vtable_once : public vtable_once_impl<Lambda, is_large<Lambda>, Return, Args...> {
static const vtable_once instance;
};
template <typename Lambda, typename Return, typename ...Args>
const vtable_once<Lambda, Return, Args...> vtable_once<Lambda, Return, Args...>::instance = {};
template <typename Lambda, bool IsLarge, typename Return, typename ...Args> struct vtable_impl;
template <typename Lambda, typename Return, typename ...Args>
struct vtable_impl<Lambda, true, Return, Args...> : public vtable_once_impl<Lambda, true, Return, Args...> {
using JustLambda = std::decay_t<Lambda>;
using LambdaPtr = std::unique_ptr<JustLambda>;
using Parent = vtable_once_impl<Lambda, true, Return, Args...>;
static void construct_copy_other_method(void *storage, const void *source) {
auto source_lambda = static_cast<const LambdaPtr*>(source);
new (storage) LambdaPtr(std::make_unique<JustLambda>(*source_lambda->get()));
}
static Return const_call_method(const void *storage, Args... args) {
auto lambda_ptr = static_cast<const LambdaPtr*>(storage)->get();
return (*static_cast<const JustLambda*>(lambda_ptr))(std::forward<Args>(args)...);
}
vtable_impl() : Parent(
&vtable_impl::construct_copy_other_method,
&vtable_impl::const_call_method
) {
}
};
template <typename Lambda, typename Return, typename ...Args>
struct vtable_impl<Lambda, false, Return, Args...> : public vtable_once_impl<Lambda, false, Return, Args...> {
using JustLambda = std::decay_t<Lambda>;
using Parent = vtable_once_impl<Lambda, false, Return, Args...>;
static void construct_copy_other_method(void *storage, const void *source) {
auto source_lambda = static_cast<const JustLambda*>(source);
new (storage) JustLambda(static_cast<const JustLambda &>(*source_lambda));
}
static Return const_call_method(const void *storage, Args... args) {
static_assert(!lambda_is_mutable<JustLambda>, "For mutable lambda use base::lambda_once wrapper");
return (*static_cast<const JustLambda*>(storage))(std::forward<Args>(args)...);
}
vtable_impl() : Parent(
&vtable_impl::construct_copy_other_method,
&vtable_impl::const_call_method
) {
}
};
template <typename Lambda, typename Return, typename ...Args>
struct vtable : public vtable_impl<Lambda, is_large<Lambda>, Return, Args...> {
static const vtable instance;
};
template <typename Lambda, typename Return, typename ...Args>
const vtable<Lambda, Return, Args...> vtable<Lambda, Return, Args...>::instance = {};
} // namespace lambda_internal
template <typename Return, typename ...Args>
class lambda_once<Return(Args...)> {
using VTable = lambda_internal::vtable_base<Return, Args...>;
public:
using return_type = Return;
lambda_once() {
data_.vtable = nullptr;
}
lambda_once(const lambda_once &other) = delete;
lambda_once &operator=(const lambda_once &other) = delete;
// Move construct / assign from the same type.
lambda_once(lambda_once &&other) {
if ((data_.vtable = other.data_.vtable)) {
data_.vtable->construct_move_other(data_.storage, other.data_.storage);
}
}
lambda_once &operator=(lambda_once &&other) {
if (this != &other) {
if (data_.vtable) {
data_.vtable->destruct(data_.storage);
}
if ((data_.vtable = other.data_.vtable)) {
data_.vtable->construct_move_other(data_.storage, other.data_.storage);
data_.vtable->destruct(other.data_.storage);
other.data_.vtable = nullptr;
}
}
return *this;
}
// Move construct / assign from a derived type.
lambda_once(lambda<Return(Args...)> &&other) {
if ((data_.vtable = other.data_.vtable)) {
data_.vtable->construct_move_other(data_.storage, other.data_.storage);
data_.vtable->destruct(other.data_.storage);
other.data_.vtable = nullptr;
}
}
lambda_once &operator=(lambda<Return(Args...)> &&other) {
if (this != &other) {
if (data_.vtable) {
data_.vtable->destruct(data_.storage);
}
if ((data_.vtable = other.data_.vtable)) {
data_.vtable->construct_move_other(data_.storage, other.data_.storage);
data_.vtable->destruct(other.data_.storage);
other.data_.vtable = nullptr;
}
}
return *this;
}
// Copy construct / assign from a derived type.
lambda_once(const lambda<Return(Args...)> &other) {
if ((data_.vtable = other.data_.vtable)) {
data_.vtable->construct_copy_other(data_.storage, other.data_.storage);
}
}
lambda_once &operator=(const lambda<Return(Args...)> &other) {
if (this != &other) {
if (data_.vtable) {
data_.vtable->destruct(data_.storage);
}
if ((data_.vtable = other.data_.vtable)) {
data_.vtable->construct_copy_other(data_.storage, other.data_.storage);
}
}
return *this;
}
// Copy / move construct / assign from an arbitrary type.
template <typename Lambda>
lambda_once(Lambda other) {
data_.vtable = &lambda_internal::vtable_once<Lambda, Return, Args...>::instance;
lambda_internal::vtable_once<Lambda, Return, Args...>::construct_move_lambda_method(data_.storage, &other);
}
template <typename Lambda>
lambda_once &operator=(Lambda other) {
if (data_.vtable) {
data_.vtable->destruct(data_.storage);
}
data_.vtable = &lambda_internal::vtable_once<Lambda, Return, Args...>::instance;
lambda_internal::vtable_once<Lambda, Return, Args...>::construct_move_lambda_method(data_.storage, &other);
return *this;
}
void swap(lambda_once &other) {
if (this != &other) {
std::swap(*this, other);
}
}
inline Return operator()(Args... args) {
t_assert(data_.vtable != nullptr);
return data_.vtable->call(data_.storage, std::forward<Args>(args)...);
}
explicit operator bool() const {
return (data_.vtable != nullptr);
}
~lambda_once() {
if (data_.vtable) {
data_.vtable->destruct(data_.storage);
}
}
protected:
struct Private {
};
lambda_once(const VTable *vtable, const Private &) {
data_.vtable = vtable;
}
struct Data {
char storage[lambda_internal::kStorageSize];
const VTable *vtable;
};
union {
lambda_internal::alignment alignment_;
char raw_[lambda_internal::kFullStorageSize];
Data data_;
};
};
template <typename Return, typename ...Args>
class lambda<Return(Args...)> final : public lambda_once<Return(Args...)> {
using Parent = lambda_once<Return(Args...)>;
public:
lambda() = default;
// Move construct / assign from the same type.
lambda(lambda<Return(Args...)> &&other) : Parent(std::move(other)) {
}
lambda &operator=(lambda<Return(Args...)> &&other) {
Parent::operator=(std::move(other));
return *this;
}
// Copy construct / assign from the same type.
lambda(const lambda<Return(Args...)> &other) : Parent(other) {
}
lambda &operator=(const lambda<Return(Args...)> &other) {
Parent::operator=(other);
return *this;
}
// Copy / move construct / assign from an arbitrary type.
template <typename Lambda>
lambda(Lambda other) : Parent(&lambda_internal::vtable<Lambda, Return, Args...>::instance, typename Parent::Private()) {
lambda_internal::vtable<Lambda, Return, Args...>::construct_move_lambda_method(this->data_.storage, &other);
}
template <typename Lambda>
lambda &operator=(Lambda other) {
if (this->data_.vtable) {
this->data_.vtable->destruct(this->data_.storage);
}
this->data_.vtable = &lambda_internal::vtable<Lambda, Return, Args...>::instance;
lambda_internal::vtable<Lambda, Return, Args...>::construct_move_lambda_method(this->data_.storage, &other);
return *this;
}
inline Return operator()(Args... args) const {
t_assert(this->data_.vtable != nullptr);
return this->data_.vtable->const_call(this->data_.storage, std::forward<Args>(args)...);
}
void swap(lambda &other) {
if (this != &other) {
std::swap(*this, other);
}
}
};
// Guard lambda call by one or many QObject* weak pointers.
namespace internal {
template <int N>
class lambda_guard_creator;
namespace lambda_internal {
template <int N, typename Lambda>
class lambda_guard_data {
class guard_data {
public:
using return_type = typename lambda_type<Lambda>::return_type;
template <typename ...PointersAndLambda>
inline lambda_guard_data(PointersAndLambda&&... qobjectsAndLambda) : _lambda(init(_pointers, std::forward<PointersAndLambda>(qobjectsAndLambda)...)) {
inline guard_data(PointersAndLambda&&... qobjectsAndLambda) : _lambda(init(_pointers, std::forward<PointersAndLambda>(qobjectsAndLambda)...)) {
}
inline lambda_guard_data(const lambda_guard_data &other) : _lambda(other._lambda) {
inline guard_data(const guard_data &other) : _lambda(other._lambda) {
for (auto i = 0; i != N; ++i) {
_pointers[i] = other._pointers[i];
}
}
template <typename ...Args>
inline return_type operator()(Args&&... args) {
for (int i = 0; i != N; ++i) {
if (!_pointers[i]) {
return return_type();
}
}
return _lambda(std::forward<Args>(args)...);
}
template <typename ...Args>
inline return_type operator()(Args&&... args) const {
for (int i = 0; i != N; ++i) {
@@ -458,31 +497,36 @@ private:
};
template <int N, typename Lambda>
class lambda_guard {
class guard {
public:
using return_type = typename lambda_type<Lambda>::return_type;
template <typename ...PointersAndLambda>
inline lambda_guard(PointersAndLambda&&... qobjectsAndLambda) : _data(std::make_unique<lambda_guard_data<N, Lambda>>(std::forward<PointersAndLambda>(qobjectsAndLambda)...)) {
inline guard(PointersAndLambda&&... qobjectsAndLambda) : _data(std::make_unique<guard_data<N, Lambda>>(std::forward<PointersAndLambda>(qobjectsAndLambda)...)) {
static_assert(sizeof...(PointersAndLambda) == N + 1, "Wrong argument count!");
}
inline lambda_guard(const lambda_guard &&other) : _data(std::move(other._data)) {
inline guard(const guard &other) : _data(std::make_unique<guard_data<N, Lambda>>(static_cast<const guard_data<N, Lambda> &>(*other._data))) {
}
inline lambda_guard(lambda_guard &&other) : _data(std::move(other._data)) {
inline guard(guard &&other) : _data(std::move(other._data)) {
}
inline lambda_guard &operator=(const lambda_guard &&other) {
inline guard &operator=(const guard &&other) {
_data = std::move(other._data);
return *this;
}
inline lambda_guard &operator=(lambda_guard &&other) {
inline guard &operator=(guard &&other) {
_data = std::move(other._data);
return *this;
}
template <typename ...Args>
inline return_type operator()(Args&&... args) {
return (*_data)(std::forward<Args>(args)...);
}
template <typename ...Args>
inline return_type operator()(Args&&... args) const {
return (*_data)(std::forward<Args>(args)...);
@@ -492,51 +536,45 @@ public:
return !_data;
}
lambda_guard clone() const {
return lambda_guard(*this);
}
private:
inline lambda_guard(const lambda_guard &other) : _data(std::make_unique<lambda_guard_data<N, Lambda>>(static_cast<const lambda_guard_data<N, Lambda> &>(*other._data))) {
}
mutable std::unique_ptr<lambda_guard_data<N, Lambda>> _data;
mutable std::unique_ptr<guard_data<N, Lambda>> _data;
};
template <int N, int K, typename ...PointersAndLambda>
struct lambda_guard_type;
struct guard_type;
template <int N, int K, typename Pointer, typename ...PointersAndLambda>
struct lambda_guard_type<N, K, Pointer, PointersAndLambda...> {
using type = typename lambda_guard_type<N, K - 1, PointersAndLambda...>::type;
struct guard_type<N, K, Pointer, PointersAndLambda...> {
using type = typename guard_type<N, K - 1, PointersAndLambda...>::type;
};
template <int N, typename Lambda>
struct lambda_guard_type<N, 0, Lambda> {
using type = lambda_guard<N, Lambda>;
struct guard_type<N, 0, Lambda> {
using type = guard<N, Lambda>;
};
template <typename ...PointersAndLambda>
struct lambda_guard_type_helper {
struct guard_type_helper {
static constexpr int N = sizeof...(PointersAndLambda);
using type = typename lambda_guard_type<N - 1, N - 1, PointersAndLambda...>::type;
using type = typename guard_type<N - 1, N - 1, PointersAndLambda...>::type;
};
template <typename ...PointersAndLambda>
using lambda_guard_t = typename lambda_guard_type_helper<PointersAndLambda...>::type;
using guard_t = typename guard_type_helper<PointersAndLambda...>::type;
template <int N, typename Lambda>
struct lambda_type_helper<lambda_guard<N, Lambda>> {
using type = typename lambda_type_helper<Lambda>::type;
struct type_helper<guard<N, Lambda>> {
using type = typename type_helper<Lambda>::type;
static constexpr auto is_mutable = type_helper<Lambda>::is_mutable;
};
} // namespace internal
} // namespace lambda_internal
template <typename ...PointersAndLambda>
inline internal::lambda_guard_t<PointersAndLambda...> lambda_guarded(PointersAndLambda&&... qobjectsAndLambda) {
inline lambda_internal::guard_t<PointersAndLambda...> lambda_guarded(PointersAndLambda&&... qobjectsAndLambda) {
static_assert(sizeof...(PointersAndLambda) > 0, "Lambda should be passed here.");
return internal::lambda_guard_t<PointersAndLambda...>(std::forward<PointersAndLambda>(qobjectsAndLambda)...);
return lambda_internal::guard_t<PointersAndLambda...>(std::forward<PointersAndLambda>(qobjectsAndLambda)...);
}
// Pass lambda instead of a Qt void() slot.
@@ -545,20 +583,20 @@ class lambda_slot_wrap : public QObject {
Q_OBJECT
public:
lambda_slot_wrap(QObject *parent, lambda<void()> &&lambda) : QObject(parent), _lambda(std::move(lambda)) {
lambda_slot_wrap(QObject *parent, lambda_once<void()> lambda) : QObject(parent), _lambda(std::move(lambda)) {
}
public slots:
void action() {
public slots :
void action() {
_lambda();
}
private:
lambda<void()> _lambda;
lambda_once<void()> _lambda;
};
inline lambda_slot_wrap *lambda_slot(QObject *parent, lambda<void()> &&lambda) {
inline lambda_slot_wrap *lambda_slot(QObject *parent, lambda_once<void()> lambda) {
return new lambda_slot_wrap(parent, std::move(lambda));
}
@@ -566,21 +604,21 @@ class lambda_slot_once_wrap : public QObject {
Q_OBJECT
public:
lambda_slot_once_wrap(QObject *parent, lambda<void()> &&lambda) : QObject(parent), _lambda(std::move(lambda)) {
lambda_slot_once_wrap(QObject *parent, lambda_once<void()> lambda) : QObject(parent), _lambda(std::move(lambda)) {
}
public slots :
void action() {
public slots :
void action() {
_lambda();
delete this;
}
private:
lambda<void()> _lambda;
lambda_once<void()> _lambda;
};
inline lambda_slot_once_wrap *lambda_slot_once(QObject *parent, lambda<void()> &&lambda) {
inline lambda_slot_once_wrap *lambda_slot_once(QObject *parent, lambda_once<void()> lambda) {
return new lambda_slot_once_wrap(parent, std::move(lambda));
}

2
Telegram/SourceFiles/core/single_timer.cpp
View File

@@ -28,7 +28,7 @@ SingleTimer::SingleTimer(QObject *parent) : QTimer(parent) {
Sandbox::connect(SIGNAL(adjustSingleTimers()), this, SLOT(adjust()));
}
void SingleTimer::setTimeoutHandler(base::lambda<void()> &&handler) {
void SingleTimer::setTimeoutHandler(base::lambda<void()> handler) {
if (_handler && !handler) {
disconnect(this, SIGNAL(timeout()), this, SLOT(onTimeout()));
} else if (handler && !_handler) {

2
Telegram/SourceFiles/core/single_timer.h
View File

@@ -31,7 +31,7 @@ public:
void setSingleShot(bool); // is not available
void start(); // is not available
void setTimeoutHandler(base::lambda<void()> &&handler);
void setTimeoutHandler(base::lambda<void()> handler);
public slots:
void start(int msec);

19
Telegram/SourceFiles/core/task_queue.cpp
View File

@@ -195,7 +195,7 @@ TaskQueue *TaskQueue::TaskQueueList::TakeFirst(int list_index_) {
void TaskQueue::TaskThreadPool::AddQueueTask(TaskQueue *queue, Task &&task) {
QMutexLocker lock(&queues_mutex_);
queue->tasks_.push_back(new Task(std::move(task)));
queue->tasks_.push_back(std::move(task));
auto list_was_empty = queue_list_.Empty(kAllQueuesList);
auto threads_count = threads_.size();
auto all_threads_processing = (threads_count == tasks_in_process_);
@@ -258,7 +258,7 @@ void TaskQueue::TaskThreadPool::ThreadFunction() {
bool serial_queue_destroyed = false;
bool task_was_processed = false;
while (true) {
std::unique_ptr<Task> task;
Task task;
{
QMutexLocker lock(&queues_mutex_);
@@ -297,7 +297,7 @@ void TaskQueue::TaskThreadPool::ThreadFunction() {
t_assert(!queue->tasks_.empty());
task.reset(queue->tasks_.front());
task = std::move(queue->tasks_.front());
queue->tasks_.pop_front();
if (queue->type_ == Type::Serial) {
@@ -318,7 +318,7 @@ void TaskQueue::TaskThreadPool::ThreadFunction() {
}
}
(*task)();
task();
}
}
@@ -336,15 +336,12 @@ TaskQueue::~TaskQueue() {
thread_pool->RemoveQueue(this);
}
}
for (auto task : take(tasks_)) {
delete task;
}
}
void TaskQueue::Put(Task &&task) {
if (type_ == Type::Main) {
QMutexLocker lock(&tasks_mutex_);
tasks_.push_back(new Task(std::move(task)));
tasks_.push_back(std::move(task));
Sandbox::MainThreadTaskAdded();
} else {
@@ -372,7 +369,7 @@ void TaskQueue::ProcessMainTasks(TimeMs max_time_spent) { // static
}
bool TaskQueue::ProcessOneMainTask() { // static
std::unique_ptr<Task> task;
Task task;
{
QMutexLocker lock(&Main().tasks_mutex_);
auto &tasks = Main().tasks_;
@@ -380,11 +377,11 @@ bool TaskQueue::ProcessOneMainTask() { // static
return false;
}
task.reset(tasks.front());
task = std::move(tasks.front());
tasks.pop_front();
}
(*task)();
task();
return true;
}

4
Telegram/SourceFiles/core/task_queue.h
View File

@@ -22,7 +22,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
namespace base {
using Task = lambda<void()>;
using Task = lambda_once<void()>;
// An attempt to create/use a TaskQueue or one of the default queues
// after the main() has returned leads to an undefined behaviour.
@@ -69,7 +69,7 @@ private:
const Type type_;
const Priority priority_;
QList<Task*> tasks_; // TODO: std::deque<Task>
std::deque<Task> tasks_;
QMutex tasks_mutex_; // Only for the main queue.
// Only for the other queues, not main.