5de20e45e4
to find my previous attempt at this, which only obscured the problem <noelgrandin> I'm such an idiot <noelgrandin> I changed a whole bunch of code to avoid calling const methods on a non-const object <noelgrandin> from p->foo() to std::as_const(*p).foo() <noelgrandin> can you spot the mistake? <bubli> Is this a job interview question? :D <vmiklos> noelgrandin: you did the opposite, now you always call const member functions, while you wanted to always call non-const member functions? <noelgrandin> more like a "why didn't the smart people on this channel tell me I was an idiot" :-) <noelgrandin> in this case, we have o3tl::cow_wrapper, which overrides operator* and operator-> <vmiklos> ah, and by the time you would add/remove the const, cow_wrapper already did the expensive task of copying based on const/non-const <noelgrandin> exactly <thorsten> heh Change-Id: I5366e6a87c414b862668b61e6adfbccfdd9d3b04 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/126473 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
|
|
/*
|
|
* This file is part of the LibreOffice project.
|
|
*
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
*/
|
|
|
|
#include "config_clang.h"
|
|
#include "o3tl/cow_wrapper.hxx"
|
|
#include <utility>
|
|
|
|
struct ImplBitmapPalette
|
|
{
|
|
void foo() const;
|
|
};
|
|
|
|
struct BitmapPalette
|
|
{
|
|
void foo1()
|
|
{
|
|
// expected-error@+1 {{calling const method on o3tl::cow_wrapper impl class via non-const pointer, rather use std::as_const to prevent triggering an unnecessary copy [loplugin:cow_wrapper]}}
|
|
mpImpl->foo();
|
|
}
|
|
void foo2() const
|
|
{
|
|
// no error expected
|
|
mpImpl->foo();
|
|
}
|
|
void foo3()
|
|
{
|
|
// expected-error@+1 {{calling const method on o3tl::cow_wrapper impl class via non-const pointer, rather use std::as_const to prevent triggering an unnecessary copy [loplugin:cow_wrapper]}}
|
|
(*mpImpl).foo();
|
|
}
|
|
void foo4()
|
|
{
|
|
// expected-error@+1 {{calling const method on o3tl::cow_wrapper impl class via non-const pointer, rather use std::as_const to prevent triggering an unnecessary copy [loplugin:cow_wrapper]}}
|
|
std::as_const(*mpImpl).foo();
|
|
}
|
|
o3tl::cow_wrapper<ImplBitmapPalette> mpImpl;
|
|
};
|
|
|
|
/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
|