Partial Application
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. 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.
main.cpp
123456789101112131415161718192021222324252627#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 return 0; }
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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. 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.
main.cpp
123456789101112131415161718192021222324252627#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 return 0; }
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