C++ #define NOMINMAX 使用 std::min/max
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#define NOMINMAX using std::min/max
提问by NaturalDemon
i recently added:
我最近补充说：
#define NOMINMAX
#include <Windows.h>
#include <algorithm>
to my main.cpp in order to use
到我的 main.cpp 以便使用
std::max( x , x ); // x is just a placeholder and not actual anything
std::min( x , x );
but i can't use std::max()/std::min()in other files.
但我不能std::max()/std::min()在其他文件中使用。
error C2589: '(' : illegal token on right side of '::'
error C2059: syntax error : '::'
i tried to add #define NOMINMAXin my other files, but fails. what is the clue?
我试图添加#define NOMINMAX我的其他文件，但失败了。线索是什么？
i looked around before asking, but i don't understand the answer Possible problems with NOMINMAX on Visual C++
我在问之前环顾四周，但我不明白答案可能存在 NOMINMAX 在 Visual C++ 上的问题
回答by Pete Becker
If you're really desperate, put parentheses around the function names:
如果您真的很绝望，请在函数名称周围加上括号：
(std::min)(x, y);
This syntax won't apply a function-like macro. (Formally, to apply a function-like macro the name of the macro must be followed by optional white space then a '('.)
此语法不会应用类似函数的宏。（正式地，要应用类似函数的宏，宏的名称必须后跟可选的空格，然后是“(”。)
回答by hmjd
Define NOMINMAXvia a compiler flag:
NOMINMAX通过编译器标志定义：
> cl.exe -DNOMINMAX ...
this will then be defined for all of the source files. I don't use the IDEs but this page provides guidance on navigating the IDE to set this: Using STL in Windows Program Can Cause Min/Max Conflicts :
这将为所有源文件定义。我不使用 IDE，但此页面提供了有关导航 IDE 以进行设置的指导：在 Windows 程序中使用 STL 会导致最小/最大冲突 ：
Simply define the NOMINMAX preprocessor symbol. This can be done in the Developer Studio project under Build, Settings, on the C/C++ tab, in the Preprocessor category. This will suppress the min and max definitions in Windef.h.
只需定义 NOMINMAX 预处理器符号。这可以在 Developer Studio 项目中的 Build、Settings 下的 C/C++ 选项卡上的 Preprocessor 类别中完成。这将抑制 Windef.h 中的 min 和 max 定义。
回答by David Gausmann
If you define NOMINMAX, because you prefer the STL version, then you may get problems while including gdiplus.h, which uses the min/max macro. As solution you need to include the STL headers and use "using namespace std" beforeyou include the gdiplus.h.
如果您定义 NOMINMAX，因为您更喜欢 STL 版本，那么在包含使用 min/max 宏的 gdiplus.h 时可能会遇到问题。作为解决方案，您需要在包含gdiplus.h之前包含STL 标头并使用“使用命名空间 std” 。
In example:
例如：
#define NOMINMAX
// Include C++ headers
#include <algorithm>
using namespace std;
// Include Windows headers
#include <windows.h>
#include <gdiplus.h>
回答by Tom
It's likely that your problem is that you #define NOMINMAXafter you #include "windows.h". It is important that the #definecome first.
你的问题很可能是你#define NOMINMAX在追求你#include "windows.h"。重要的#define是先来。
The reason is that windows.h (actually I think windef.h, which is included by windows.h) has code similar to this:
原因是windows.h（其实我觉得windef.h，是windows.h中包含的）有类似这样的代码：
#ifndef NOMINMAX
#define min(x,y) ((x) < (y) ? (x) : (y))
#define max(x,y) ((x) > (y) ? (x) : (y))
#endif
So #define NOMINMAXis telling the compiler (or actually the preprocessor) to skip over the definitions of minand max, but it will only apply if you do it before you #include "windows.h".
所以#define NOMINMAX告诉编译器（或实际预处理器）跳过的定义min和max，但如果你在你面前做只会适用#include "windows.h"。
