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std::make_signed

STD：使[医]签名

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

如果T是除bool%29或枚举类型外的整数%28，则提供成员类型type的整数类型。T，使用相同的cv-限定符。

否则，行为就没有定义。

成员类型

NameDefinition
typethe signed integer type corresponding to T

帮助者类型

template< class T > using make_signed_t = typename make_signed::type;​(since C++14)

例

二次

#include <iostream>
#include <type_traits>
 
int main() {
    typedef std::make_signed<char>::type char_type;
    typedef std::make_signed<int>::type int_type;
    typedef std::make_signed<volatile long>::type long_type;
 
    bool ok1 = std::is_same<char_type, signed char>::value;
    bool ok2 = std::is_same<int_type, signed int>::value;
    bool ok3 = std::is_same<long_type, volatile signed long>::value;
 
    std::cout << std::boolalpha
    << "char_type is 'signed char'?          : " << ok1 << '\n'
    << "int_type  is 'signed int'?           : " << ok2 << '\n'
    << "long_type is 'volatile signed long'? : " << ok3 << '\n';
}

二次

产出：

二次

char_type is 'signed char'?          : true
int_type  is 'signed int'?           : true
long_type is 'volatile signed long'? : true

二次

另见

is_signed (C++11)checks if a type is signed arithmetic type (class template)
is_unsigned (C++11)checks if a type is unsigned arithmetic type (class template)
make_unsigned (C++11)makes the given integral type unsigned (class template)

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