Tag: include
5 posts
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C++ Preprocessor Directives: #include, #define, and #ifdef
How the C++ preprocessor handles #include, #define, #if/#ifdef and #pragma, why macros misbehave (double evaluation, dangling else), and when to use constexpr.
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C++ Header Guards: #ifndef vs #pragma once and Portability
How #ifndef guards and #pragma once stop double inclusion, why they cannot prevent multiple definition link errors, macro collisions and circular includes.
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C++ Include Paths: #include '...' vs <...>, -I, and CMake
How the compiler searches for headers: angle vs quotes, -I order, CMake target_include_directories, and fixing “No such file or directory” errors.
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C++ Header Files : Declarations, Include Guards, and What
How C++ headers declare APIs while .cpp files define behavior: ODR-safe patterns, include guards, forward declarations, templates, inline functions.
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C++ Include Errors: Fixing “No such file or directory”
Resolve #include failures: typos, -I paths, case sensitivity, circular dependencies, forward declarations, and #pragma once vs include guards.