Converts the System::Variant::Variant to a double value.
__fastcall operator double() const;
The double conversion System::Variant::double returns a double or a reference to a double that is a conversion of this System::Variant::Variant. If the double* conversion is used, the System::Variant::double sets the varByRef bit, meaning that the System::Variant::Variant contains a reference as opposed to a value.
If the conversion operation is not possible because of an invalid variant type conversion, an EVariantError exception is thrown.
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