C++advancedcpp20

Templates and concepts

Write one definition that works for many types, then constrain it with C++20 concepts so misuse fails early with a readable message.

Function and class templates generate code per type; C++20 concepts and requires clauses replace cryptic SFINAE with named, composable constraints the compiler checks up front.

A function template deduced from its arguments

C++intro

0ms

82.5pear8

Reference · output compiled offline, not runnable in-browser

One myMax definition serves three types — int, double, and std::string (where pear wins lexicographically) — with T deduced from each call. The final 8 comes from myMax<double>(3, 8), where pinning T=double converts both int arguments and the result prints as 8.