std::construct_at 定义于头文件<memory> template<classT,class...Args> constexprT*construct_at(T*p, Args&&...args); (C++20 起) 在给定地址p创建以参数args...初始化的T对象。此重载仅若::new(std::declval<void*>())T(std::declval<Args>()...)在不求值语境中为良构才参与重载决议。
std::construct_at 定义于头文件<memory> template<classT,class...Args> constexprT*construct_at(T*p, Args&&...args); (C++20 起) 在给定地址p创建以参数args...初始化的T对象。此重载仅若::new(std::declval<void*>())T(std::declval<Args>()...)在不求值语境中为良构才参与重载决议。
::new(std::declval<void*>())T(std::declval<Args>()...)is well-formed when treated as anunevaluated operand. Ifstd::is_array_v<T>istrueandsizeof...(Args)is nonzero, the program is ill-formed. Parameters location-pointer to the uninitialized storage on which aTobject will be constru...
#include <memory> constexpr int f() { struct S { const int y = 0; } s; std::construct_at(&s.y, 1); return s.y; } is valid and accepted by GCC and Clang. Unfortunately, your compiler rejects it: 1>error C2672: 'std::construct_at': no matching ...
return ::new (const_cast<void*>(static_cast<const volatile void*>(p))) T(std::forward<Args>(args)...); “通过”const volatile void*类型的转换是出于什么需要或目的?换句话说,为什么construct_at不直接等同于 return ::new (static_cast<void*>(p)) T(std::forward<Args>(args)...); ...
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LWG-3436 std::construct_at should support arraysActivity StephanTLavavejadded LWGLibrary Working Group issue on Nov 24, 2024 github-project-automationmoved this to Available in STL LWG Issueson Nov 24, 2024 github-project-automationadded this to STL LWG Issueson Nov 24, 2024 StephanTLavavej...
b = a; std::cout << "b = " << b << std::endl; }); std::thre ...
C2672 'std::construct_at' no matching overloaded function found xmemory (line 698) Closed - Not a Bug18 0Votes jojohn3.16 -Reported Sep 12, 2024 2:24 AM [severity:It bothers me. A fix would be nice] Compile is successful attempt to debug gets this error...
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