numeric_limits::is_signed

测试,如果类型具有一个签名的表示形式。

static const bool is_signed = false;

返回值

true,如果类型具有一个签名的表示形式;false,则不是。

备注

成员存储 true 具有一个签名的表示形式,是所有预定义的浮点值和带符号整数类型大小写的类型。

示例

// numeric_limits_is_signaled.cpp
// compile with: /EHsc
#include <iostream>
#include <limits>

using namespace std;

int main( )
{
   cout << "Whether float objects have a signed representation: "
        << numeric_limits<float>::is_signed
        << endl;
   cout << "Whether double objects have a signed representation: "
        << numeric_limits<double>::is_signed
        << endl;
   cout << "Whether signed char objects have a signed representation: "
        << numeric_limits<signed char>::is_signed
        << endl;
   cout << "Whether unsigned char objects have a signed representation: "
        << numeric_limits<unsigned char>::is_signed
        << endl;
}
  

要求

页眉: <限制>

命名空间: std

请参见

参考

strstreambuf 类