如何在c ++中定义编译单元？ [英] How is compilation unit defined in c++?

问题描述

可能重复：

什么是翻译单位？ in C ++

通常说的是在C / C ++中声明的静态变量在编译单元中不可见？这是否意味着每个.c或.cpp文件是一个单独的编译单元？ h文件和.h文件中声明的静态变量怎么办？

解决方案

头文件没有独立的生命，只有内容 #included 转换为.c或.cpp文件。但由于 #include 由预处理器处理，编译器不知道有关不同的头文件;它只看到生成的代码列表作为输入。这是所谓的编译单元：具有所有 #include 指令的源文件被相关头文件的内容替换。 p>

Possible Duplicate:
What is a “translation unit” in C++

It is often said that the static variables declared in C/C++ are not visible across compilation units ? Does this mean that each .c or .cpp file is a seperate compilation unit ? What about a ,h file and the static variables declared in the .h file ? Is .h file also considered as a separate compilation unit ?

解决方案

Header files have no separate life, only their content is #included into .c or .cpp files. But since #include is handled by the preprocessor, the compiler has no knowledge about distinct header files; it only sees the resulting code listing as input. This is what is called a compilation unit: a source file with all its #include directives replaced by the content of the relevant header files.

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