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Reduce template instantiations when importing std.bitmanip

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This commit is contained in:
Andrei Alexandrescu 2021-05-07 19:47:28 -04:00 • committed by Mathias LANG
parent f04cbc612f
commit 3c45f08ab6
1 changed files with 42 additions and 40 deletions
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82
std/bitmanip.d
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@ -786,7 +786,7 @@ if (is(T == class))
/**
Allows manipulating the fraction, exponent, and sign parts of a
$(D_PARAM float) separately. The definition is:
`float` separately. The definition is:
----
struct FloatRep
@ -803,17 +803,52 @@ struct FloatRep
}
----
*/
struct FloatRep
alias FloatRep = FloatingPointRepresentation!float;
/**
Allows manipulating the fraction, exponent, and sign parts of a
`double` separately. The definition is:
----
struct DoubleRep
{
union
{
float value;
double value;
mixin(bitfields!(
uint, "fraction", 23,
ubyte, "exponent", 8,
bool, "sign", 1));
ulong, "fraction", 52,
ushort, "exponent", 11,
bool, "sign", 1));
}
enum uint bias = 1023, signBits = 1, fractionBits = 52, exponentBits = 11;
}
----
*/
alias DoubleRep = FloatingPointRepresentation!double;
private struct FloatingPointRepresentation(T)
{
static if (is(T == float))
{
enum uint bias = 127, fractionBits = 23, exponentBits = 8, signBits = 1;
alias FractionType = uint;
alias ExponentType = ubyte;
}
else
{
enum uint bias = 1023, fractionBits = 52, exponentBits = 11, signBits = 1;
alias FractionType = ulong;
alias ExponentType = ushort;
}
union
{
T value;
mixin(bitfields!(
FractionType, "fraction", fractionBits,
ExponentType, "exponent", exponentBits,
bool, "sign", signBits));
}
enum uint bias = 127, fractionBits = 23, exponentBits = 8, signBits = 1;
}
///
@ -864,39 +899,6 @@ struct FloatRep
assert(rep.sign);
}
/**
Allows manipulating the fraction, exponent, and sign parts of a
$(D_PARAM double) 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;
}
----
*/
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;
}
///
@safe unittest
{