concat - MichaelMiller-/sec21 GitHub Wiki
#include <sec21/concat.h>
Joins string-convertible objects into one string. There are overloads for std::tuple and variadic template parameters. It is also possible to specify the delimiter between the objects.
auto input = std::make_tuple("foo", "bar", "baz");
auto result = concat(input, "+++"); // == "foo+++bar+++baz");