oysteikt/mpd
0
0
Fork 0
Code Issues Pull Requests Releases Activity

util/VarSize: convert static_assert to concept check

Browse Source
This commit is contained in:
Max Kellermann 2023-09-06 15:04:57 +02:00
parent c96e8ab47c
commit 1448f52eac
1 changed files with 2 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/util/VarSize.hxx
View File

@ -1,8 +1,7 @@
// SPDX-License-Identifier: BSD-2-Clause // SPDX-License-Identifier: BSD-2-Clause
// author: Max Kellermann <max.kellermann@gmail.com> // author: Max Kellermann <max.kellermann@gmail.com>
#ifndef MPD_VAR_SIZE_HXX #pragma once
#define MPD_VAR_SIZE_HXX
#include <type_traits> #include <type_traits>
#include <utility> #include <utility>
@ -21,13 +20,11 @@
* #T * #T
*/ */
template<class T, typename... Args> template<class T, typename... Args>
requires std::is_standard_layout_v<T>
[[gnu::malloc]] [[gnu::returns_nonnull]] [[gnu::malloc]] [[gnu::returns_nonnull]]
T * T *
NewVarSize(size_t declared_tail_size, size_t real_tail_size, Args&&... args) NewVarSize(size_t declared_tail_size, size_t real_tail_size, Args&&... args)
{ {
static_assert(std::is_standard_layout<T>::value,
"Not standard-layout");
/* determine the total size of this instance */ /* determine the total size of this instance */
size_t size = sizeof(T) - declared_tail_size + real_tail_size; size_t size = sizeof(T) - declared_tail_size + real_tail_size;
@ -53,5 +50,3 @@ DeleteVarSize(T *instance)
/* free memory */ /* free memory */
free(instance); free(instance);
} }
#endif