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Enum member std.traits.ifTestable
enum ifTestable(T, alias pred)
= __traits(compiles, ()
{
if (pred(T .init))
{
}
}
);
Returns
true
iff the type T
can be tested in an if
-expression, that is if if (pred(T
is compilable.
Example
class C;
struct S1;
struct S2
{
T opCast(T)() const;
}
static assert( ifTestable!bool);
static assert( ifTestable!int);
static assert( ifTestable!(S1*));
static assert( ifTestable!(typeof(null)));
static assert( ifTestable!(int[]));
static assert( ifTestable!(int[string]));
static assert( ifTestable!S2);
static assert( ifTestable!C);
static assert(!ifTestable!S1);
Authors
Walter Bright,
Tomasz Stachowiak (isExpressions
),
Andrei Alexandrescu,
Shin Fujishiro,
Robert Clipsham,
David Nadlinger,
Kenji Hara,
Shoichi Kato
License
Copyright © 1999-2024 by the D Language Foundation | Page generated by ddox.