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Alias std.traits.CopyConstness
Returns the type of ToType
with the "constness" of FromType
. A type's constness
refers to whether it is const
, immutable
, or inout
. If FromType
has no constness, the
returned type will be the same as ToType
.
alias CopyConstness(FromType, ToType)
= Unshared!(CopyTypeQualifiers!(FromType,ToType));
Example
const(int) i;
CopyConstness!(typeof(i), float) f;
assert( is(typeof(f) == const float));
CopyConstness!(char, uint) u;
assert( is(typeof(u) == uint));
//The 'shared' qualifier will not be copied
assert(!is(CopyConstness!(shared bool, int) == shared int));
//But the constness will be
assert( is(CopyConstness!(shared const real, double) == const double));
//Careful, const(int)[] is a mutable array of const(int)
alias MutT = CopyConstness!(const(int)[], int);
assert(!is(MutT == const(int)));
//Okay, const(int[]) applies to array and contained ints
alias CstT = CopyConstness!(const(int[]), int);
assert( is(CstT == const(int)));
Authors
Walter Bright,
Tomasz Stachowiak (isExpressions
),
Andrei Alexandrescu,
Shin Fujishiro,
Robert Clipsham,
David Nadlinger,
Kenji Hara,
Shoichi Kato
License
Copyright © 1999-2022 by the D Language Foundation | Page generated by ddox.