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std::make_signed

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Revision as of 06:21, 1 March 2013 by 74.104.151.109 (Talk)

 
 
 
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Template:ddcl list begin <tr class="t-dsc-header">

<td>
Defined in header <type_traits>
</td>

<td></td> <td></td> <tr class="t-dcl-sep"><td></td><td></td><td></td></tr>

<tr class="t-dcl ">

<td >
template< class T >
struct make_signed;
</td>

<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> Template:ddcl list end

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

Member types

Name Definition
type the signed integer type corresponding to T

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

See also

(C++11)
checks if a type is signed arithmetic type
(class template) [edit]
checks if a type is unsigned arithmetic type
(class template) [edit]
makes the given integral type unsigned
(class template) [edit]