cpp lambda function

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

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

The capture clause is used to capture variables from the surrounding scope. It can be either empty, capture specific variables by value, or capture specific variables by reference.

The parameters are the input parameters of the lambda function.

The return_type specifies the return type of the lambda function.

The function body contains the actual implementation of the lambda function.

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

auto sum = -> int { return a + b; };

In this example, the lambda function captures no variables from the surrounding scope, takes two integers as input, specifies an integer return type, and returns the sum of the input integers.