错误：'INT32_MAX'未在此作用域中声明 [英] error: 'INT32_MAX' was not declared in this scope

问题描述

我收到错误

 错误：'INT32_MAX'未在此范围内声明
  

但我已包括

  #include< stdint.h> （gcc）4.1.2 20080704（Red Hat 4.1.2-GCC）编译这个的时候， 44）使用命令
  g ++ -m64 -O3 blah.cpp 
  pre> 
 
 
我需要做任何其他事情来获得这个编译？或者是另一个C ++方式获取常量 INT32_MAX 
解决方案  
 / div> 
  #include< cstdint> //或&stdint.h> 
 #include< limits> 
 
 std： ：numeric_limits< std :: int32_t> :: max（）; 
  
注意< cstdint> 是C ++ 11标题，< stdint.h> 是C标题， 
 
 
 
以下代码适用于C ++ 11。
  #include< iostream> 
 #include< limits> 
 #include< cstdint> 
 
 struct X 
 {
 static const std： ：int32_t i = std :: numeric_limits< std :: int32_t> :: max（）; 
}; 
 
 int main（）
 {
 switch（std :: numeric_limits< std :: int32_t> :: max（））{
 case std :: numeric_limits< std :: int32_t> :: max（）：
 std :: cout<< 这段代码的工作原理感谢constexpr\\\
; 
 break; 
} 
 return EXIT_SUCCESS; 
} 
  
  http://coliru.stacked-crooked.com/a/4a33984ede3f2f7e  
 
I'm getting the error
error: 'INT32_MAX' was not declared in this scope
But I have already included 
#include <stdint.h>
I am compiling this on (g++ (GCC) 4.1.2 20080704 (Red Hat 4.1.2-44) with the command
g++ -m64 -O3 blah.cpp
Do I need to do anything else to get this to compile? or is there another C++ way to get the constant "INT32_MAX"?

Thanks and let me know if anything is unclear!
解决方案
 #include <cstdint> //or <stdint.h>
 #include <limits>

 std::numeric_limits<std::int32_t>::max();
Note that <cstdint> is a C++11 header and <stdint.h> is a C header, included for compatibility with C standard library.

Following code works, since C++11.
#include <iostream>
#include <limits>
#include <cstdint>

struct X 
{ 
    static const std::int32_t i = std::numeric_limits<std::int32_t>::max(); 
};

int main()
{
    switch(std::numeric_limits<std::int32_t>::max()) { 
       case std::numeric_limits<std::int32_t>::max():
           std::cout << "this code works thanks to constexpr\n";
           break;
    }
    return EXIT_SUCCESS;
}
http://coliru.stacked-crooked.com/a/4a33984ede3f2f7e

                        
这篇关于错误：'INT32_MAX'未在此作用域中声明的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！