79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2011-2016 Danny Robson <danny@nerdcruft.net>
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*/
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#pragma once
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#include "types/sized.hpp"
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///////////////////////////////////////////////////////////////////////////////
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namespace cruft {
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template <unsigned int EXPONENT, unsigned int SIGNIFICAND>
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class ieee_float
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{
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public:
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static const unsigned int EXPONENT_BITS = EXPONENT;
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static const unsigned int SIGNIFICAND_BITS = SIGNIFICAND;
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static const unsigned int TOTAL_BITS = 1 + EXPONENT + SIGNIFICAND;
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static const unsigned int BIAS = (1 << (EXPONENT - 1)) - 1;
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using sint_t = typename types::sized::bits<TOTAL_BITS>::sint;
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using uint_t = typename types::sized::bits<TOTAL_BITS>::uint;
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using real_t = typename types::sized::bits<TOTAL_BITS>::real;
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protected:
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union {
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uint_t m_bits;
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real_t m_floating;
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struct {
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uint_t sign : 1;
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uint_t exponent : EXPONENT;
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uint_t significand : SIGNIFICAND;
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} m_components;
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};
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public:
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ieee_float (void);
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ieee_float (real_t _floating);
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ieee_float (const ieee_float &rhs);
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static unsigned int bias (void)
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{ return BIAS; }
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void set_bits (uint_t _bits) { m_bits = _bits; }
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uint_t bits (void) const { return m_bits; }
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bool negative (void) const { return m_components.sign; }
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void negate (void) { m_components.sign ^= m_components.sign; }
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bool is_zero (void) const;
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bool is_subnormal (void) const;
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bool is_inifinity (void) const;
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bool is_nan (void) const;
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bool operator== (real_t) const;
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static bool almost_equal (real_t, real_t);
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static bool almost_equal (real_t, real_t, unsigned ulps);
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};
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//typedef ieee_float< 5, 10> ieee_half;
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typedef ieee_float< 8, 23> ieee_single;
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typedef ieee_float<11, 52> ieee_double;
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//extern template class ieee_float< 5,10>;
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extern template class ieee_float< 8,23>;
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extern template class ieee_float<11,52>;
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//static_assert (sizeof(ieee_half ) == 2, "ieee_half must be 2 bytes");
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static_assert (sizeof(ieee_single ) == 4, "ieee_single must be 4 bytes");
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static_assert (sizeof(ieee_double ) == 8, "ieee_double must be 8 bytes");
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}
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