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Use of #pragma in C - Stack Overflow 65 #pragma is used to do something implementation-specific in C, i e be pragmatic for the current context rather than ideologically dogmatic The one I regularly use is #pragma pack(1) where I'm trying to squeeze more out of my memory space on embedded solutions, with arrays of structures that would otherwise end up with 8 byte alignment
Difference between #pragma and _Pragma() in C - Stack Overflow Pragma directives specify machine- or operating-specific compiler features The __pragma keyword, which is specific to the Microsoft compiler, enables you to code pragma directives within macro definitions
What does #pragma once mean in C? - Stack Overflow In the C and C++ programming languages, #pragma once is a non-standard but widely supported preprocessor directive designed to cause the current source file to be included only once in a single compilation Thus, #pragma once serves the same purpose as #include guards, but with several advantages, including: less code, avoiding name clashes, and improved compile speed See the Wikipedia
c - What does #pragma message do? - Stack Overflow The #pragma is a preprocessor directive that provides additional information to the compiler They are not part of the core language but allow for various compiler-specific customizations and optimizations The correct syntax for #pragma message requires the message to be enclosed in parentheses and double quotes The pragma message can be used to output a message during compilation For
What is __pragma and what are the differences between __pragma and #pragma 15 #pragma is a preprocessor directive in its own right; it can't be used within a #define directive So, this is why __pragma exists: it provides a way for a pragma to be issued from wherever the macro that uses it is expanded This is a non-standard compiler extension (MSVC, Intel, and some C compilers support it to varying degrees)
Where does the word pragma come from? - Stack Overflow A pragma (from the Greek word meaning action) is used to direct the actions of the compiler in particular ways, but has no effect on the semantics of a program (in general)
What does #pragma comment mean? - Stack Overflow #pragma comment is a compiler directive which indicates Visual C++ to leave a comment in the generated object file The comment can then be read by the linker when it processes object files #pragma comment(lib, libname) tells the linker to add the 'libname' library to the list of library dependencies, as if you had added it in the project properties at Linker->Input->Additional dependencies
c - #pragma pack effect - Stack Overflow #pragma pack instructs the compiler to pack structure members with particular alignment Most compilers, when you declare a struct, will insert padding between members to ensure that they are aligned to appropriate addresses in memory (usually a multiple of the type's size)
c++ - #pragma once vs include guards? - Stack Overflow For those who would like to use #pragma once and include guards together: If you are not using MSVC, then you won't get much optimization from #pragma once And you shouldn't put "#pragma once" into a header that supposed to be included multiple times with each inclusion possibly having a different effect