Namespaces
Variants
Views
Actions

std::make_signed

From cppreference.com
< cpp‎ | types
Revision as of 16:52, 1 July 2013 by P12bot (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
 
 
 
Type support
Basic types
Fundamental types
Fixed width integer types (C++11)
Numeric limits
C numeric limits interface
Runtime type information
Type traits
Primary type categories
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Type properties
(C++11)
(C++11)
(C++11)
(C++14)
Supported operations
Relationships and property queries
(C++11)
(C++11)
(C++11)
(C++11)
Type modifications
(C++11)(C++11)(C++11)
make_signed
(C++11)
Type transformations
(C++11)
(C++11)
(C++11)
Type trait constants
 
Defined in header <type_traits>
template< class T >
struct make_signed;
(since C++11)

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.

Contents

[edit] Member types

Name Definition
type the signed integer type corresponding to T

[edit] Helper types

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

[edit] 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

[edit] 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]