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70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
#pragma once
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#include <string>
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#include <ostream>
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#include <fmt/format.h>
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#include "wide_integer.h"
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namespace wide
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{
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template <size_t Bits, typename Signed>
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inline std::string to_string(const integer<Bits, Signed> & n)
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{
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std::string res;
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if (integer<Bits, Signed>::_impl::operator_eq(n, 0U))
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return "0";
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integer<Bits, unsigned> t;
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bool is_neg = integer<Bits, Signed>::_impl::is_negative(n);
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if (is_neg)
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t = integer<Bits, Signed>::_impl::operator_unary_minus(n);
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else
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t = n;
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while (!integer<Bits, unsigned>::_impl::operator_eq(t, 0U))
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{
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res.insert(res.begin(), '0' + char(integer<Bits, unsigned>::_impl::operator_percent(t, 10U)));
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t = integer<Bits, unsigned>::_impl::operator_slash(t, 10U);
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}
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if (is_neg)
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res.insert(res.begin(), '-');
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return res;
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}
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}
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template <size_t Bits, typename Signed>
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std::ostream & operator<<(std::ostream & out, const wide::integer<Bits, Signed> & value)
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{
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return out << to_string(value);
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}
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/// See https://fmt.dev/latest/api.html#formatting-user-defined-types
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template <size_t Bits, typename Signed>
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struct fmt::formatter<wide::integer<Bits, Signed>>
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{
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constexpr auto parse(format_parse_context & ctx)
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{
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auto it = ctx.begin();
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auto end = ctx.end();
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/// Only support {}.
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if (it != end && *it != '}')
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throw format_error("invalid format");
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return it;
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}
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template <typename FormatContext>
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auto format(const wide::integer<Bits, Signed> & value, FormatContext & ctx)
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{
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return format_to(ctx.out(), "{}", to_string(value));
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}
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};
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