Simplest C++ Callback, from SumatraPDF

a year ago

SumatraPDF is a Windows GUI application for viewing PDF, ePub, and comic books, written in C++.
Callbacks in GUI programs combine a function and data, known as closures in programming.
C++ offers std::function<> and lambdas for closures, but they can complicate crash report analysis due to auto-generated names.
The author proposes a simpler, more understandable callback solution than std::function<>, despite its limitations.
The solution involves a basic Func0 struct for closures, addressing type safety and casting issues with MkFunc0 template.
Func0 and Func1 are introduced for handling callbacks with no arguments and one additional argument, respectively.
The author's approach is smaller, faster, and easier to understand than std::function<>, with benefits in size and compilation speed.
Despite the boilerplate required, the solution is preferred for its simplicity and the author's familiarity with it.

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