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The evolution of a callable stands for the evolution of C++. Here are the main evolution steps.

It all started with a function. Additionally, C++98 supports objects that behave like functions. These function-like objects are called function objects, and can have state.

C++11 added lambda expressions to the C++ standard. Lambda expressions behave like data and support in-place invocation and capturing of state. Lambdas can be generic in …