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When compiling source.cpp for the first time with the precompiled header feature turned on, the compiler will generate a precompiled header, header.pch.The next time, if the timestamp of this header did not change, the compiler can skip the compilation phase relating to header.hpp and instead use header.pch directly.
C++ (/ ˈ s iː p l ʌ s p l ʌ s /, pronounced "C plus plus" and sometimes abbreviated as CPP) is a high-level, general-purpose programming language created by Danish computer scientist Bjarne Stroustrup.
An include directive instructs a text file processor to replace the directive text with the content of a specified file.. The act of including may be logical in nature. The processor may simply process the include file content at the location of the directive without creating a combined file.
For #include guards to work properly, each guard must test and conditionally set a different preprocessor macro. Therefore, a project using #include guards must work out a coherent naming scheme for its include guards, and make sure its scheme doesn't conflict with that of any third-party headers it uses, or with the names of any globally visible macros.
Traditionally, C++ code would be divided between a header file (typically with extension .h, .hpp or .hh) and a source file (typically with extension .cpp or .cc). The header file usually contained declarations of symbols while the source file contained the actual implementation, such as function implementations.
Using #pragma once allows the C preprocessor to include a header file when it is needed and to ignore an #include directive otherwise. This has the effect of altering the behavior of the C preprocessor itself, and allows programmers to express file dependencies in a simple fashion, obviating the need for manual management.
Translation units define a scope, roughly file scope, and functioning similarly to module scope; in C terminology this is referred to as internal linkage, which is one of the two forms of linkage in C. Names (functions and variables) declared outside of a function block may be visible either only within a given translation unit, in which case they are said to have internal linkage – they are ...
In the context of the C or C++ programming languages, a library is called header-only if the full definitions of all macros, functions and classes comprising the library are visible to the compiler in a header file form. [1]