std::make_unsigned

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C++
 
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类型的支持
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Basic types
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is_assignable
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is_move_assignable
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make_unsigned（C++11）
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integral_constant（C++11）
 
Defined in header <type_traits>
template< class T >
struct make_unsigned;
 （C++11 起）
鉴于一个不可分割的（除bool）或者枚举类型T，提供成员typedeftype，这是对应于T的无符号整数类型，相同的cv修饰符.
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Given an integral (except bool) or enumeration type T, provides the member typedef type which is the unsigned integer type corresponding to T, with the same cv-qualifiers.
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[编辑] 会员类型

姓名
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Name
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 Definition
type
无符号整数类型对应的T
Original:
the unsigned integer type corresponding to T
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[编辑] 为例

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

Output: 

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

[编辑] 另请参阅

（C++11）
检查
Original:
checks if a type is signed arithmetic type
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（类模板） [edit]
（C++11）
如果一个类型的检查是无符号的算术类型
Original:
checks if a type is unsigned arithmetic type
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（类模板） [edit]
（C++11）
整体式签署
Original:
makes the given integral type signed
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（类模板） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/types/make_unsigned&oldid=27233”