在编译时在浮点精度和双精度之间切换 [英] Switching between float and double precision at compile time

问题描述

如果要在编译时在浮点精度和双精度之间切换，我应该在哪里查看.就像，如果用户希望所有内容都以浮点数而不是双精度数，该如何保持这种灵活性?换句话说，我该如何定义一个有条件地为float或double precision的变量?

Where should I look at if I want to switch between float and double precision at compile time. Its like, if user wants everything in float instead of double precision how I can maintain this flexibility? In other words, how should I define a variable that could be either float or double precision conditionally?

推荐答案

如果可以在编译时进行切换，则简单的typedef即可:

If it is OK to make the switch at compile time, a simple typedef would do:

#ifdef USE_DOUBLES
typedef double user_data_t;
#else
typedef float user_data_t;
#endif

在代码中使用user_data_t，如果要在编译时使用doubles，则设置USE_DOUBLES:

Use user_data_t in your code, and set USE_DOUBLES if you want doubles at compile time:

g++ -DUSE_DOUBLES=1 myprogram.cpp

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