pongasoft::Utils::OstreamWritable Concept Reference

Allows to detect whether a type defines ostream << x at compile time. More...

#include <Metaprogramming.h>

Concept definition

template<typename T>
concept OstreamWritable =
  requires(std::ostream& os, T const& t)
  {
    { os << t } -> std::same_as<std::ostream&>;
  }

Detailed Description

Allows to detect whether a type defines ostream << x at compile time.

Example:

if constexpr (Utils::is_operator_write_to_ostream_defined<MyType>) {
  // implementation allows to write std::cout << x // (with x of type MyType)
} else {
  // no such operator... alternate implementation
}