我的程序中有这样的调试输出:
I have debug output in my program like this:
#define DEBUG
...
#ifdef DEBUG
std::cout << "[RE_words] " << m_re << std::endl;
#endif
和 DEBUG 是在我的程序中手动定义的.我总是在发布版本时注释掉这一行.在 Visual Studio 中，还有 Debug 和 Release 版本的配置，用于处理用于编译的命令行等.我还可以使用配置调试"来自动定义 DEBUG 给编译器吗?怎么样?
and DEBUG is defined in my program manually. I always comment out the line when I make a release version. In Visual Studio, there are also Configurations for Debug vs Release versions which handle the commandline etc. used for compiling. Can I also use the Configuration "Debug" to automatically define DEBUG to the compiler? How?
Visual Studio 自动为调试版本定义 _DEBUG 符号(以及用于非调试版本的 NDEBUG).
The Visual Studio automatically defines _DEBUG symbol for Debug builds (and NDEBUG for non-debug builds).
另一种方法是进入项目设置 -> 配置属性 -> C/C++ -> 预处理器，手动编辑预处理器定义.
Another way to do this is to go to the project settings -> configuration properties -> C/C++ -> preprocessor, and edit the preprocessor definitions manually.
另见:
这个答案更详细地解释了 _DEBUG 和 NDEBUG 之间的区别.
这个答案解释了 NDEBUG 符号的用途以及它是否由标准定义.
See also:
This answer explains the differences between _DEBUG and NDEBUG in more detail.
This answer explains the purpose of the NDEBUG symbol and whether or not is it defined by the standard.
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