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Function std.conv.signed

Returns the corresponding signed value for x (e.g. if x has type uint, it returns cast(int) x). The advantage compared to the cast is that you do not need to rewrite the cast if x later changes type (e.g from uint to ulong).

auto signed(T) (
  T x
if (isIntegral!T);

Note that the result is always mutable even if the original type was const or immutable. In order to retain the constness, use Signed.


import std.traits : Signed;

immutable uint u = 42;
auto s1 = signed(u); //not qualified
static assert(is(typeof(s1) == int));
Signed!(typeof(u)) s2 = signed(u); //same qualification
static assert(is(typeof(s2) == immutable int));
immutable s3 = signed(u); //explicitly qualified


Walter Bright, Andrei Alexandrescu, Shin Fujishiro, Adam D. Ruppe, Kenji Hara


Boost License 1.0.