C++ Performance Comparison: Lambda Functions vs. Function Objects

What are the performance differences between lambda functions and function objects in C++?

Lambda functions in C++ are often more concise and can capture variables from their surrounding scope, while function objects may have a slight performance edge in some cases due to their static nature. However, the difference is usually negligible in most applications.

Can you give me an example of when to use a lambda function over a function object?

Certainly! Use a lambda function when you need a quick, inline function for a short task, like sorting a vector with a custom comparator. Function objects are better for more complex operations that require state.

Are there any scenarios where function objects outperform lambda functions?

Yes, function objects can outperform lambda functions in scenarios where you need to reuse the same function multiple times, as they can be defined once and used without the overhead of capturing variables.

What about readability? Which is more readable?

Lambda functions are generally more readable for simple tasks due to their concise syntax. However, for complex logic, function objects can be clearer as they can be named and structured more explicitly.