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The All-in-One Guide to C++20

Guidelines for a Module Structure

Explore the principles of structuring C++20 modules effectively. Understand how to use the global module fragment, organize headers, handle module purview, and manage imports and exports for better compilation and code clarity.

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Let’s examine guidelines for how to structure a module.

C++
module;                      // global module fragment 
#include <headers for libraries not modularized so far>
export module math;          // module declaration; starts the module purview 
import <importing of other modules> 
<non-exported declarations>  // names only visibile inside the module
export namespace math {
    <exported declarations>  // exported names 
}

This guideline serves one purpose: give you a simplified structure of a module and an idea of what I’m going to write about. So, what’s new in this module structure?

  • The global module ...