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Alias std.range.primitives.ElementType
The element type of R
. R
does not have to be a range. The
element type is determined as the type yielded by r
for an
object r
of type R
. For example, ElementType!(T[])
is
T
if T[]
isn't a narrow string; if it is, the element type is
dchar
. If R
doesn't have front
, ElementType!R
is
void
.
alias ElementType(R)
= T;
Example
import std .range : iota;
// Standard arrays: returns the type of the elements of the array
static assert(is(ElementType!(int[]) == int));
// Accessing .front retrieves the decoded dchar
static assert(is(ElementType!(char[]) == dchar)); // rvalue
static assert(is(ElementType!(dchar[]) == dchar)); // lvalue
// Ditto
static assert(is(ElementType!(string) == dchar));
static assert(is(ElementType!(dstring) == immutable(dchar)));
// For ranges it gets the type of .front.
auto range = iota(0, 10);
static assert(is(ElementType!(typeof(range)) == int));
Authors
Andrei Alexandrescu, David Simcha, and Jonathan M Davis. Credit for some of the ideas in building this module goes to Leonardo Maffi.
License
Copyright © 1999-2022 by the D Language Foundation | Page generated by ddox.