derek.holloway
7502bf64a4
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28 lines
2.0 KiB
C++
28 lines
2.0 KiB
C++
// RUN: %clang_cc1 -fms-compatibility -fms-compatibility-version=19.33 -std=c++20 -verify=supported %s
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// RUN: %clang_cc1 -fms-compatibility -fms-compatibility-version=19.32 -std=c++20 -verify=unsupported %s
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// RUN: %clang_cc1 -fms-compatibility -fms-compatibility-version=19.33 -std=c++20 -verify=supported %s -fexperimental-new-constant-interpreter
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// RUN: %clang_cc1 -fms-compatibility -fms-compatibility-version=19.32 -std=c++20 -verify=unsupported %s -fexperimental-new-constant-interpreter
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// supported-no-diagnostics
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[[nodiscard]]
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[[msvc::constexpr]] // unsupported-warning {{unknown attribute 'msvc::constexpr' ignored}}
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inline void* operator new(decltype(sizeof(void*)), void* p) noexcept { return p; }
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namespace std {
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constexpr int* construct_at(int* p, int v) {
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[[msvc::constexpr]] return ::new (p) int(v); // unsupported-warning {{unknown attribute 'msvc::constexpr' ignored}}
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}
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}
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constexpr bool check_std_construct_at() { int x; return *std::construct_at(&x, 42) == 42; }
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static_assert(check_std_construct_at());
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constexpr int* construct_at(int* p, int v) { [[msvc::constexpr]] return ::new (p) int(v); } // unsupported-error {{constexpr function never produces a constant expression}} \
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// unsupported-warning {{unknown attribute 'msvc::constexpr' ignored}} \
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// unsupported-note 2{{this placement new expression is not supported in constant expressions before C++2c}}
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constexpr bool check_construct_at() { int x; return *construct_at(&x, 42) == 42; } // unsupported-note {{in call to 'construct_at(&x, 42)'}}
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static_assert(check_construct_at()); // unsupported-error {{static assertion expression is not an integral constant expression}}\
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// unsupported-note {{in call to 'check_construct_at()'}}
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