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Placeholder Syntax

Explore how placeholder syntax evolves in modern C++, from unconstrained auto in C++11 to constrained concepts in C++20. Understand how generic lambdas become function templates and how concepts enforce type safety and consistency in templates, making generic programming simpler and more reliable.

With auto, C++11 has unconstrained placeholders. We can use concepts in C++20 as constrained placeholders. Decisive quantum leap does not look so thrilling at the first glimpse. C++ templates will become easy to use C++ features.

According to our ...