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C++20 STL Cookbook

Call Multiple Lambdas with the Same Input

Explore how to call multiple lambda expressions with the same input by using a wrapper function in C++20. Understand how to capture values and use nested loops to invoke different lambda instances, enhancing your functional programming skills with STL lambdas.

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We can easily create multiple instances of a lambda with different capture values by wrapping the lambda in a function. This allows us to call different versions of a lambda with the same input.

How to do it

This is a simple example of a lambda that wraps a value in different types of braces:

  • We’ll start by creating the wrapper function braces():

auto braces (const char a, const char b) {
    return [a, b](const char v) {
        cout << format("{}{}{} ", a, v, b);
    };
}

The braces() function wraps a lambda that returns a three-value string, where the first and last ...