c++ lambda

A lambda function in C++ is an anonymous function that can be defined inline. It is defined using the following syntax:

[ captures ] ( parameters ) -> return_type {
    // function body
}

Where: - captures are variables captured from the enclosing scope. - parameters are the function parameters. - return_type is the return type of the lambda function. - function body contains the actual code of the lambda function.

Here's an example of a simple lambda function that takes two integers and returns their sum:

auto sum = [](int a, int b) -> int {
    return a + b;
};

In this example: - auto is used to automatically deduce the return type of the lambda function. - [](int a, int b) defines the lambda function taking two integers. - -> int specifies that the return type is int. - return a + b; is the function body that returns the sum of the two integers.