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Enum member std.traits.isNarrowString
Detect whether type T
is a narrow string.
enum isNarrowString(T)
= is(immutable(T) == immutable(C[]), C) && (is(C == char) || is(C == wchar));
All arrays that use char, wchar, and their qualified versions are narrow strings. (Those include string and wstring).
Example
static assert(isNarrowString!string);
static assert(isNarrowString!wstring);
static assert(isNarrowString!(char[]));
static assert(isNarrowString!(wchar[]));
static assert(!isNarrowString!dstring);
static assert(!isNarrowString!(dchar[]));
static assert(!isNarrowString!(typeof(null)));
static assert(!isNarrowString!(char[4]));
enum ES : string { a = "aaa", b = "bbb" }
static assert(!isNarrowString!ES);
static struct Stringish
{
string str;
alias str this;
}
static assert(!isNarrowString!Stringish);
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.