Function Composition
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Function composition is a powerful technique that lets you combine multiple functions or predicates to build more complex operations from simpler ones. In C++, you can achieve function composition and chaining by using lambdas and standard algorithms. This approach is especially useful when you want to apply a series of transformations or filters to collections, such as vectors, in a concise and expressive way.
main.cpp
1234567891011121314151617181920212223242526#include <iostream> #include <vector> #include <algorithm> int main() { std::vector<int> numbers{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; // First lambda: filter even numbers auto is_even = [](int x) { return x % 2 == 0; }; // Second lambda: square a number auto square = [](int x) { return x * x; }; // Compose: filter then transform std::vector<int> evens; std::copy_if(numbers.begin(), numbers.end(), std::back_inserter(evens), is_even); std::vector<int> squared_evens; std::transform(evens.begin(), evens.end(), std::back_inserter(squared_evens), square); std::cout << "Squared even numbers: "; for (int n : squared_evens) std::cout << n << " "; std::cout << std::endl; }
By composing functions, you can create pipelines where the output of one function becomes the input of the next, making your code modular and easier to maintain.
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Seksjon 2. Kapittel 4
