<limits> support

The following from <limits> are overloaded for each type with associated values for reference:

#include <boost/decimal/decimal32_t.hpp>
#include <boost/decimal/decimal64_t.hpp>
#include <boost/decimal/decimal128_t.hpp>

namespace std {

template <>
struct numeric_limits<boost::decimal::decimal32_t>
{
    static constexpr bool is_specialized = true;
    static constexpr bool is_signed = true;
    static constexpr bool is_integer = false;
    static constexpr bool is_exact = false;
    static constexpr bool has_infinity = true;
    static constexpr bool has_quiet_NaN = true;
    static constexpr bool has_signaling_NaN = true;

    // These members were deprecated in C++23
    static constexpr std::float_denorm_style has_denorm = std::denorm_present;
    static constexpr bool has_denorm_loss = true;

    static constexpr std::float_round_style round_style = std::round_indeterminate;
    static constexpr bool is_iec559 = true;
    static constexpr bool is_bounded = true;
    static constexpr bool is_modulo = false;
    static constexpr int digits = 7;
    static constexpr int digits10 = digits;
    static constexpr int max_digits10 = digits;
    static constexpr int radix = 10;
    static constexpr int min_exponent = -95;
    static constexpr int min_exponent10 = min_exponent;
    static constexpr int max_exponent = 96;
    static constexpr int max_exponent10 = max_exponent;
    static constexpr bool traps = numeric_limits<std::uint32_t>::traps;
    static constexpr bool tinyness_before = true;

    // Member functions
    static constexpr boost::decimal::decimal32_t min()
    static constexpr boost::decimal::decimal32_t max();
    static constexpr boost::decimal::decimal32_t lowest();
    static constexpr boost::decimal::decimal32_t epsilon();
    static constexpr boost::decimal::decimal32_t round_error();
    static constexpr boost::decimal::decimal32_t infinity();
    static constexpr boost::decimal::decimal32_t quiet_NaN();
    static constexpr boost::decimal::decimal32_t signaling_NaN();
    static constexpr boost::decimal::decimal32_t denorm_min();
};

template <>
struct numeric_limits<boost::decimal::decimal64_t>
{
    static constexpr bool is_specialized = true;
    static constexpr bool is_signed = true;
    static constexpr bool is_integer = false;
    static constexpr bool is_exact = false;
    static constexpr bool has_infinity = true;
    static constexpr bool has_quiet_NaN = true;
    static constexpr bool has_signaling_NaN = true;

    // These members were deprecated in C++23
    static constexpr std::float_denorm_style has_denorm = std::denorm_present;
    static constexpr bool has_denorm_loss = true;

    static constexpr std::float_round_style round_style = std::round_indeterminate;
    static constexpr bool is_iec559 = true;
    static constexpr bool is_bounded = true;
    static constexpr bool is_modulo = false;
    static constexpr int  digits = 16;
    static constexpr int  digits10 = digits;
    static constexpr int  max_digits10 = digits;
    static constexpr int  radix = 10;
    static constexpr int  min_exponent = -382;
    static constexpr int  min_exponent10 = min_exponent;
    static constexpr int  max_exponent = 385;
    static constexpr int  max_exponent10 = max_exponent;
    static constexpr bool traps = numeric_limits<std::uint64_t>::traps;
    static constexpr bool tinyness_before = true;

    // Member functions
    static constexpr boost::decimal::decimal64_t min()
    static constexpr boost::decimal::decimal64_t max();
    static constexpr boost::decimal::decimal64_t lowest();
    static constexpr boost::decimal::decimal64_t epsilon();
    static constexpr boost::decimal::decimal64_t round_error();
    static constexpr boost::decimal::decimal64_t infinity();
    static constexpr boost::decimal::decimal64_t quiet_NaN();
    static constexpr boost::decimal::decimal64_t signaling_NaN();
    static constexpr boost::decimal::decimal64_t denorm_min();
};

template<>
struct numeric_limits<boost::decimal::decimal128_t>
{
    static constexpr bool is_specialized = true;
    static constexpr bool is_signed = true;
    static constexpr bool is_integer = false;
    static constexpr bool is_exact = false;
    static constexpr bool has_infinity = true;
    static constexpr bool has_quiet_NaN = true;
    static constexpr bool has_signaling_NaN = true;

    // These members were deprecated in C++23
    static constexpr std::float_denorm_style has_denorm = std::denorm_present;
    static constexpr bool has_denorm_loss = true;

    static constexpr std::float_round_style round_style = std::round_indeterminate;
    static constexpr bool is_iec559 = true;
    static constexpr bool is_bounded = true;
    static constexpr bool is_modulo = false;
    static constexpr int  digits = 34;
    static constexpr int  digits10 = digits;
    static constexpr int  max_digits10 = digits;
    static constexpr int  radix = 10;
    static constexpr int  min_exponent = -6142;
    static constexpr int  min_exponent10 = min_exponent;
    static constexpr int  max_exponent = 6145;
    static constexpr int  max_exponent10 = max_exponent;
    static constexpr bool traps = numeric_limits<std::uint64_t>::traps;
    static constexpr bool tinyness_before = true;

    // Member functions
    static constexpr boost::decimal::decimal128_t min()
    static constexpr boost::decimal::decimal128_t max();
    static constexpr boost::decimal::decimal128_t lowest();
    static constexpr boost::decimal::decimal128_t epsilon();
    static constexpr boost::decimal::decimal128_t round_error();
    static constexpr boost::decimal::decimal128_t infinity();
    static constexpr boost::decimal::decimal128_t quiet_NaN();
    static constexpr boost::decimal::decimal128_t signaling_NaN();
    static constexpr boost::decimal::decimal128_t denorm_min();
};

} // Namespace std

The fast types each have the same member values as their corresponding non-fast type above, and are also contained in the same file as the class implementation.

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