How to Eliminate C/C++ Header File Circular Includes and Speed Up Compilation

This article explains why circular header inclusion in C/C++ causes compilation errors and performance issues, and provides practical solutions such as include guards, #pragma once, forward declarations, better file organization, and the PIMPL pattern, along with real‑world examples and interview‑style Q&A.

#pragma onceCcircular inclusion

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How to Eliminate C/C++ Header File Circular Includes and Speed Up Compilation

Liangxu Linux

Apr 14, 2025 · Fundamentals

Essential C Coding Style Guide: Naming, Headers, and Comments

This guide outlines practical C coding standards covering clear and concise code, consistent naming conventions for variables, functions, constants, enums, macros, and files, proper header protection, include ordering, inline function usage, and effective commenting to improve readability and maintainability.

C programmingSoftware Engineeringcode comments

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Essential C Coding Style Guide: Naming, Headers, and Comments

Liangxu Linux

Jun 23, 2023 · Fundamentals

Why You Shouldn’t Put #include Inside extern "C" and How to Use It Correctly

This article explains the low‑level mechanics of extern "C", why placing #include directives inside an extern "C" block can cause name‑mangling and linkage errors, and provides practical guidelines and code examples for safely mixing C and C++ headers.

C interoperabilityC++extern C

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Why You Shouldn’t Put #include Inside extern "C" and How to Use It Correctly