formatting.hpp

 
#include <concepts>
#include <ostream>
#include <sstream>
 
#include "zen/config.hpp"
 
ZEN_NAMESPACE_START
 
template<typename T>
concept has_display = requires(T value, std::ostream& out) {
  { value.display(out) } -> std::same_as<void>;
};
 
template<typename T>
std::string display(const T& value);
 
template<has_display T>
std::string display(const T& value) {
  std::ostringstream out;
  value.display(out);
  return out.str();
}
 
ZEN_NAMESPACE_END