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C++ Functional Utilities

bookPartial Application

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Partial application is a functional programming technique that lets you pre-bind one or more arguments to a function, creating a new function with fewer parameters. In C++, this approach can make your code more modular and reusable by allowing you to specialize functions for specific contexts without rewriting them. You often use partial application to simplify function calls, especially when working with algorithms or higher-order functions that expect a certain function signature.

main.cpp

main.cpp

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#include <iostream>
#include <functional>

// A function that adds two integers
int add(int a, int b) {
    return a + b;
}

int main() {
    // Partially apply the first argument using a lambda
    int fixedValue = 10;
    auto add10 = [fixedValue](int b) {
        return add(fixedValue, b);
    };

    std::cout << "add10(5): " << add10(5) << std::endl; // Outputs 15

    // Use with std::function for flexibility
    std::function<int(int)> add20 = [=](int b) {
        return add(20, b);
    };

    std::cout << "add20(7): " << add20(7) << std::endl; // Outputs 27
}

This technique is particularly useful when you want to adapt general-purpose functions to work seamlessly with standard library algorithms or when you need to pre-configure behavior for callbacks and event handlers.

question mark

How does partial application improve code flexibility in C++ functional programming?

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すべて明確でしたか？

どのように改善できますか？

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セクション 3. 章 4

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