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version 2.108.1

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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).

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.