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Asked: 2026-05-23T23:55:27+00:00

We all know when to use include guard, but when shall we not use

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We all know when to use include guard, but when shall we not use it in our project?

Recently, I saw a project with mix compilation (CUDA + GCC), one header file (CUDA file) is deliberately left without include guard. I am just curious about it.

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  1. Editorial Team

    There are 2 scenarios off the top of my head:

    1. when you want to turn on/off debugging capabilities (as how assert.h works)
    2. for ‘x-macro’ type of functionality where you have the include file perform 2 parts of problem, such as defining an enum then defining an array of stringified names corresponding to the enums
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