is used SHOW( std::is_same<int, std::int64_t>::value ); // maybe false // same tests as above, except using C++17's std::is_same_v<T, U> format SHOW( std::is_same_v<int, std::int32_t> ); // maybe true SHOW( std:
template<classT>structis_null_pointer:std::is_same<std::nullptr_t,std::remove_cv_t<T>>{}; 注解 对于std::nullptr_t,std::is_pointer是false,因为它不是内建指针类型。 在libc++ 中,std::is_null_pointer不能在 C++11 模式中使用。
In many implementations, std::is_nothrow_move_constructible also checks if the destructor throws because it is effectively noexcept(T(arg)). Same applies to std::is_trivially_move_constructible, which, in these implementations, also requires that the destructor is trivial: GCC bug 51452, LWG iss...
int>);static_assert(std::is_same_v<decltype((&(foo))(0)),int>);static_assert(std::is_sa...
U> concept either = (std::same_as<T, U> || ...); template<typename T> concept is_printable = std::integral<T> || std::floating_point<T> || either<std::remove_cvref_t<std::remove_pointer_t<std::decay_t<T>>>, char, wchar_t>; void println(is_printable auto const ... ...
template<classT>structis_floating_point:std::integral_constant<bool,std::is_same<float,typenamestd::remove_cv<T>::type>::value||std::is_same<double,typenamestd::remove_cv<T>::type>::value||std::is_same<longdouble,typenamestd::remove_cv<T>::type>::value>{}; ...
support (without loss of efficiency). In the same sense, ANSI C90/C95 is a better C than K&R C. In addition, C++ supports data abstraction, object-oriented programming, and generic programming (see The C++ Programming Language; Appendix B discussing compatibility issues is available for ...
问这段来自cppreference.com (默认参数)的段落是什么意思？EN第一部分意味着允许您形成指向非静态成员...
unit, the same identifier appears with both internal and external linkage, the behavior is ...
Same as rvalue (below). A prvalue cannot be polymorphic: the dynamic type of the object it identifies is always the type of the expression. (纯右值不能是动态类型) A non-class non-array prvalue cannot be cv-qualified. (不是class也不是数组的纯右值不能声明为const, volatile, const-volatil...