View source code Display the source code in std/variant.d from which this page was generated on github. Improve this page 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. Page wiki View or edit the community-maintained wiki page associated with this page.

Function std.variant.VariantN.hasValue

Returns true if and only if the VariantN object holds a valid value (has been initialized with, or assigned from, a valid value).

Prototype

bool hasValue() const pure nothrow @property;

Example

Variant a;
assert(!a.hasValue);
Variant b;
a = b;
assert(!a.hasValue); // still no value
a = 5;
assert(a.hasValue);

Authors

Andrei Alexandrescu

License

Boost License 1.0.

Comments