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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);
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