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libstdc++: Add missing constexpr to uses-allocator construction utilities [PR104542] 

libstdc++-v3/ChangeLog:

	PR libstdc++/104542
	* include/bits/uses_allocator_args.h (make_obj_using_allocator)
	(uninitialized_construct_using_allocator): Add constexpr.
	* testsuite/20_util/uses_allocator/make_obj.cc: Check constexpr.
	* testsuite/20_util/uses_allocator/uninitialized_construct.cc: New test.
This commit is contained in:
Jonathan Wakely 2022-02-15 12:47:39 +00:00
parent d03a67dc69
commit 6cfb7ffb65
3 changed files with 48 additions and 3 deletions
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4
libstdc++-v3/include/bits/uses_allocator_args.h
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@ -196,7 +196,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
template<typename _Tp, typename _Alloc, typename... _Args>
inline _Tp
constexpr _Tp
make_obj_using_allocator(const _Alloc& __a, _Args&&... __args)
{
return std::make_from_tuple<_Tp>(
@ -205,7 +205,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
template<typename _Tp, typename _Alloc, typename... _Args>
inline _Tp*
constexpr _Tp*
uninitialized_construct_using_allocator(_Tp* __p, const _Alloc& __a,
_Args&&... __args)
{

30
libstdc++-v3/testsuite/20_util/uses_allocator/make_obj.cc
View File

@ -142,7 +142,7 @@ test01()
VERIFY( c2.alloc_id == 1 );
}
void
void
test02()
{
decltype(auto) b
@ -389,6 +389,34 @@ test08()
std::make_obj_using_allocator<X>(a);
}
constexpr bool
test_pr104542()
{
// PR libstdc++/104542 - missing constexpr
std::allocator<void> a;
int i = std::make_obj_using_allocator<int>(a, 1);
struct X {
using allocator_type = std::allocator<long>;
constexpr X(std::allocator_arg_t, std::allocator<int>, int i) : i(i+1) { }
int i;
};
X x = std::make_obj_using_allocator<X>(a, i);
struct Y {
using allocator_type = std::allocator<char>;
constexpr Y(X x, std::allocator<int>) : i(x.i+1) { }
int i;
};
Y y = std::make_obj_using_allocator<Y>(a, x);
return y.i == 3;
}
static_assert( test_pr104542() );
int
main()
{

17
libstdc++-v3/testsuite/20_util/uses_allocator/uninitialized_construct.cc Normal file
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@ -0,0 +1,17 @@
// { dg-options "-std=gnu++20" }
// { dg-do compile { target c++20 } }
#include <memory>
constexpr bool
test_pr104542()
{
// PR libstdc++/104542 - missing constexpr
std::allocator<int> a;
int* p = a.allocate(1);
int i = *std::uninitialized_construct_using_allocator<int>(p, a, 999);
a.deallocate(p, 1);
return i == 999;
}
static_assert( test_pr104542() );