Display the source code in std/traits.d from which this page was generated on github.

If you spot a problem with this page, click here to create a Bugzilla issue.

Quickly fork, edit online, and submit a pull request for this page. Requires a signed-in GitHub account. This works well for small changes. If you'd like to make larger changes you may want to consider using local clone.

Enum member `std.traits.isSomeString`

Detect whether T is one of the built-in string types.


						
				enum isSomeString(T)
				 = is(immutable(T) == immutable(C[]), C) && (is(C == char) || is(C == wchar) || is(C == dchar));

The built-in string types are Char[], where Char is any of char, wchar or dchar, with or without qualifiers.

Static arrays of characters (like char[80]) are not considered built-in string types.

Example

//String types
static assert( isSomeString!string);
static assert( isSomeString!(wchar[]));
static assert( isSomeString!(dchar[]));
static assert( isSomeString!(typeof("aaa")));
static assert( isSomeString!(const(char)[]));

//Non string types
static assert(!isSomeString!int);
static assert(!isSomeString!(int[]));
static assert(!isSomeString!(byte[]));
static assert(!isSomeString!(typeof(null)));
static assert(!isSomeString!(char[4]));

enum ES : string { a = "aaa", b = "bbb" }
static assert(!isSomeString!ES);

static struct Stringish
{
    string str;
    alias str this;
}
static assert(!isSomeString!Stringish);

Authors

Walter Bright, Tomasz Stachowiak (isExpressions), Andrei Alexandrescu, Shin Fujishiro, Robert Clipsham, David Nadlinger, Kenji Hara, Shoichi Kato

License

Boost License 1.0.