variadic min/max/minmax

[gpeterhoff]

Hello,
for min/max/minmax with multiple parameters there are only functions per std::initializer_list:
https://en.cppreference.com/w/cpp/algorithm/min
https://en.cppreference.com/w/cpp/algorithm/max
https://en.cppreference.com/w/cpp/algorithm/minmax
The parameters are always passed by value and not by reference and the result is also a value. This is a problem with types like std::array, std::string, etc.

Since the compare class cannot be the last function parameter in a variadic implementation (as in the std implementations) another position must be found, possibilities:

• first function parameter: 2 implementations would be needed each, once with compare class and once without. I don't find that useful.
• first template parameter: only one implementation is needed with default template parameter(s).

A simple variadic implementation could look like this:
minmax_variadic.hpp.txt

minmax needs 2 compare classes (each for min and max) - this is more flexible.

thx
Gero

[mclow]

There is also std::minmax_element, which takes a sequence.