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/*
* This source code is released into the public domain.
*/
module;
#include <compare>
#include <expected>
#include <format>
#include <utility>
#include <ucl.h>
export module nihil.ucl:real;
import :object;
import :type;
namespace nihil::ucl {
export struct real final : object {
using contained_type = double;
inline static constexpr object_type ucl_type = object_type::real;
/*
* Create a real holding the value 0. Throws std::system_error
* on failure.
*/
real();
/*
* Create a real holding a specific value. Throws std::system_error
* on failure.
*/
explicit real(contained_type value);
/*
* Create a new real from a UCL object. Throws type_mismatch
* on failure.
*/
real(ref_t, ::ucl_object_t const *uobj);
real(noref_t, ::ucl_object_t *uobj);
// Return the value of this real.
[[nodiscard]] auto value(this real const &self) -> contained_type;
};
/*
* Real constructors. These return an error instead of throwing.
*/
export [[nodiscard]] auto
make_real(real::contained_type = 0) -> std::expected<real, error>;
/*
* Comparison operators.
*/
export [[nodiscard]] auto operator== (real const &a, real const &b) -> bool;
export [[nodiscard]] auto operator== (real const &a,
real::contained_type b) -> bool;
export [[nodiscard]] auto operator<=> (real const &a, real const &b)
-> std::partial_ordering;
export [[nodiscard]] auto operator<=> (real const &a, real::contained_type b)
-> std::partial_ordering;
/*
* Literal operator.
*/
inline namespace literals {
export constexpr auto operator""_ucl (long double d) -> real
{
if (d > static_cast<long double>(std::numeric_limits<double>::max()) ||
d < static_cast<long double>(std::numeric_limits<double>::min()))
throw std::out_of_range("literal out of range");
return real(static_cast<double>(d));
}
} // namespace nihil::ucl::literals
} // namespace nihil::ucl
namespace nihil { inline namespace literals {
export using namespace ::nihil::ucl::literals;
}} // namespace nihil::literals
/*
* std::formatter for a real. This provides the same format operations
* as std::formatter<double>;
*/
export template<>
struct std::formatter<nihil::ucl::real, char>
{
std::formatter<double> base_formatter;
template<class ParseContext>
constexpr ParseContext::iterator parse(ParseContext& ctx)
{
return base_formatter.parse(ctx);
}
template<class FmtContext>
FmtContext::iterator format(nihil::ucl::real const &o,
FmtContext& ctx) const
{
return base_formatter.format(o.value(), ctx);
}
};
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