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std::is_literal_type

STD：：是[医]文字[医]类型

Defined in header ​​
template< class T > struct is_literal_type;​(since C++11) (deprecated in C++17)

如果T满足…的所有要求LiteralType，提供成员常量。value平等true.对于任何其他类型，value是false...

如果std::remove_all_extents_t<T>是不完整的类型，而不是%28可能是cv-合格%29。void...

模板参数

T-a type to check

辅助变量模板

template< class T > inline constexpr bool is_literal_type_v = is_literal_type::value;​(since C++17) (deprecated)

继承自STD：积分[医]常量

成员常数

value statictrue if T is a literal type, false otherwise (public static member constant)

成员函数

operator boolconverts the object to bool, returns value (public member function)
operator() (C++14)returns value (public member function)

成员类型

TypeDefinition
value_typebool
typestd::integral_constant<bool, value>

注记

只有文字类型可以用作参数，或从常数函数.只有文字类可能具有conexpr成员函数。

例

二次

#include <iostream>
#include <type_traits>
 
struct A {
    int m;
};
 
struct B {
    virtual ~B(
};
 
int main()
{
    std::cout << std::boolalpha;
    std::cout << std::is_literal_type<A>::value << '\n';
    std::cout << std::is_literal_type<B>::value << '\n';
}

二次

产出：

二次

true
false

二次

另见

二次

*。

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在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

http：//en.cppreference.com/w/cpp/type/is[医]文字[医]类型

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