2014年4月23日 · A header file is generally used to define an interface or set of interfaces within an application. Think of a header file as something which shows the external functionality of a program while omitting the technical implementation details.

Header files are files with the source code that are intended to be included into other files (source or header) by the #include preprocessor directive. This distinction is pretty important and may help to understand how to separate the code between both types of files.

2011年6月20日 · For example we include header file with .h extension in our program and its just the definition but the actual implementation is defined in library files and this is done at linking stage this is what people say but sometimes we include the library files directory too for the programs to generate the exec file for example in posix threads ...

The .cpp file is the compilation unit: it's the real source code file that will be compiled (in C++). The .h (header) files are files that will be virtually copied/pasted in the .cpp files where the #include precompiler instruction appears. Once the headers code is inserted in the .cpp code, the compilation of the .cpp can start.

2009年12月22日 · When dividing your code up into multiple files, what exactly should go into an .h file and what should go into a .cpp file?

2012年2月10日 · The header file declares functions/classes - i.e. tells the compiler when it is compiling a .cpp file what functions/classes are available. The .cpp file defines those functions - i.e. the compiler compiles the code and therefore produces the actual machine code to perform those actions that are declared in the corresponding .hpp file.

2017年5月21日 · If the project came with a Visual Studio project file, then that should already be configured to find the headers for you. If not, you'll have to add the include file directory to the project settings by right-clicking the project and selecting Properties, clicking on "C/C++", and adding the directory containing the include files to the "Additional Include Directories" edit box.

2013年7月2日 · Firstly, in general: If these .h files are indeed typical C-style header files (as opposed to being something completely different that just happens to be named with .h extension), then no, there's no reason to "compile" these header files independently. Header files are intended to be included into implementation files, not fed to the compiler as independent translation units. Since a typical ...

2016年5月13日 · I am having some trouble with vector declarations in the header file of a C++ class I am making. My entire header file looks like this: #ifndef PERSON_H #define PERSON_H #include "Message.h" #inc...

2012年4月28日 · The header guards ensure that multiple C files including the same H file don't run into issues of declaring/defining the same identifiers several times in the same program. The compiler works with "translation units", which is a C file plus all the headers included by that C file.