stringable.hpp

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#pragma once
#include "stream_insertable.hpp"
#include "iformatable.hpp"
#include "istringable.hpp"
#include "iterable.hpp"
#include "object.hpp"
#include "raw_type.hpp"
#include "textual.hpp"
#include <concepts>

namespace xtd {
  // Since Doxygen does not work properly with the C++ concept, the documentation for this concept is declared in xtd/stringable_.hpp
  template<typename value_t>
  concept stringable =
    std::derived_from<xtd::raw_type<value_t>, xtd::object> ||
    std::derived_from<xtd::raw_type<value_t>, xtd::istringable<xtd::raw_type<value_t>>> ||
    std::derived_from<xtd::raw_type<value_t>, xtd::iformatable> ||
    requires (const xtd::raw_type<value_t>& value) {{value.to_string()} -> xtd::textual;} ||
    requires (const xtd::raw_type<value_t>& value, const xtd::string& fmt) {{value.to_string(fmt)} -> xtd::textual;} ||
    std::derived_from<xtd::raw_type<value_t>, std::exception> ||
    std::is_enum_v<xtd::raw_type<value_t>> ||
    xtd::iterable<xtd::raw_type<value_t>> ||
    xtd::stream_insertable<value_t>;
}