Вивчайте Comparing Modules vs Headers

Modules, introduced in C++20, solve these issues by providing a clear separation between interface and implementation, avoiding the need for textual inclusion. Modules are compiled once and imported, so changes in a module's implementation do not force recompilation of all importers unless the interface changes. This leads to faster builds, better encapsulation, and improved code hygiene. However, migrating to modules may require build system updates and is only supported in newer compilers.

main.cpp

math.ixx


              12345678
            
import math;
#include <iostream>

int main()
{
    int result = add(2, 3);
    std::cout << "2 + 3 = " << result << std::endl;
}

The differences between modules and headers are significant in both design and practical workflow. Traditional headers (.h files) require careful management of include guards to prevent multiple definition errors; changes in headers can trigger recompilation of all dependent files, increasing build times.

main.cpp

math.h

math.cpp


              12345678
            
#include <iostream>
#include "math.h"

int main()
{
    int result = add(2, 3);
    std::cout << "2 + 3 = " << result << std::endl;
}

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Секція 3. Розділ 3

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Suggested prompts:

Can you explain how to migrate an existing project from headers to modules?

What are the main challenges when using modules in large codebases?

Are there any compatibility issues with older compilers when using modules?

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main.cpp

math.ixx


              12345678
            
import math;
#include <iostream>

int main()
{
    int result = add(2, 3);
    std::cout << "2 + 3 = " << result << std::endl;
}

main.cpp

math.h

math.cpp


              12345678
            
#include <iostream>
#include "math.h"

int main()
{
    int result = add(2, 3);
    std::cout << "2 + 3 = " << result << std::endl;
}

Все було зрозуміло?

Дякуємо за ваш відгук!

Секція 3. Розділ 3