FloatRep

Allows manipulating the fraction, exponent, and sign parts of a float separately. The definition is:

struct FloatRep
{
    union
    {
        float value;
        mixin(bitfields!(
                  uint,  "fraction", 23,
                  ubyte, "exponent",  8,
                  bool,  "sign",      1));
    }
    enum uint bias = 127, fractionBits = 23, exponentBits = 8, signBits = 1;
}

import std.bitmanip;

alias FloatRep = FloatingPointRepresentation!float

Examples

FloatRep rep = {value: 0};
assert(rep.fraction == 0);
assert(rep.exponent == 0);
assert(!rep.sign);

rep.value = 42;
assert(rep.fraction == 2621440);
assert(rep.exponent == 132);
assert(!rep.sign);

rep.value = 10;
assert(rep.fraction == 2097152);
assert(rep.exponent == 130);

FloatRep rep = {value: 1};
assert(rep.fraction == 0);
assert(rep.exponent == 127);
assert(!rep.sign);

rep.exponent = 126;
assert(rep.value == 0.5);

rep.exponent = 130;
assert(rep.value == 8);

FloatRep rep = {value: 1};
rep.value = -0.5;
assert(rep.fraction == 0);
assert(rep.exponent == 126);
assert(rep.sign);

rep.value = -1. / 3;
assert(rep.fraction == 2796203);
assert(rep.exponent == 125);
assert(rep.sign);

The OpenD Programming Language

FloatRep

Examples

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