overload.cpp

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• overload.cpp is a project that helps make it easier to implement the visitor pattern in C++17 .
• When using std::visit, you can easily overload multiple lambda functions (anonymous functions) to create concise processing for different types.

How to use

• Include the overload.hpp header file in the project.
• When using std::visit, use the 'overload' structure to overload multiple lambda functions.

Sample code

• Code

#include <iostream>
#include <variant>
#include <string>

#include "overload.hpp" // [0] Just Include overload header.

int main() {
    std::variant<int, std::string> v; // v is integer type or string type.

    v = 42; // [1] Set integer type
    std::visit(overload{
                   [](int i) { std::cout << "[1] Integer type: " << i << '\n'; },
                   [](const std::string& s) { std::cout << "[1] String type: " << s << '\n'; }
               }, v);

    v = "Hello";  // [2] Set string type
    std::visit(overload{
                   [](int i) { std::cout << "[2] Integer type: " << i << '\n'; },
                   [](const std::string& s) { std::cout << "[2] String type: " << s << '\n'; }
               }, v);

    return 0;
}

• Output

[1] Integer type: 42
[2] String type: Hello

License

• MIT License

Contact

• Leave me a issue.
  • https://github.com/JayTwoLab/overload.cpp