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How To Detect Function Overloads in C++17/20, std::from_chars Example

by Bartlomiej Filipek

From the article:

The problem: a library function offers several overloads, but depending on the implementation/compiler, some of the overloads are not available. How to check the existence of an overload? And how to provide a safe fallback?

In this article, I’ll show you a background “theory” and one case - std::from_chars that exposes full support for numbers or only integer support (in GCC, Clang)...