std::make_signed

Defined in header <type_traits>

template< class T >
struct make_signed;

(since C++11)

If T is an integral (except bool) or enumeration type, provides the member typedef type which is the signed integer type corresponding to T, with the same cv-qualifiers.

Otherwise, the behavior is undefined.

Member types

Name	Definition
`type`	the signed integer type corresponding to `T`

Helper types

template< class T >
using make_signed_t = typename make_signed<T>::type;

(since C++14)

Example

#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';
}

Output:

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

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)

std::make_signed

Member types

Helper types

Example

See also