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Struct std.bitmanip.FloatRep

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

struct FloatRep ; 
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;
}

Example

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

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

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

Example

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

rep.exponent = 126;
writeln(rep.value); // 0.5

rep.exponent = 130;
writeln(rep.value); // 8

Example

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

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

/**
Allows manipulating the fraction, exponent, and sign parts of a
<span class="d_param">double</span> separately. The definition is:

struct DoubleRep { union { double value; mixin(bitfields!( ulong, "fraction", 52, ushort, "exponent", 11, bool, "sign", 1)); } enum uint bias = 1023, signBits = 1, fractionBits = 52, exponentBits = 11;

Authors

Walter Bright, Andrei Alexandrescu, Jonathan M Davis, Alex Rønne Petersen, Damian Ziemba, Amaury SECHET

License

Boost License 1.0.