File Information
Library: Foundation
Package: Dynamic
Header: Poco/Dynamic/VarHolder.h
Description
Template based implementation of a VarHolder. This class provides type storage for user-defined types that do not have VarHolderImpl specialization.
The actual conversion work happens in the template specializations of this class.
VarHolderImpl throws following exceptions: BadCastException (if the requested conversion is not implemented) RangeException (if an attempt is made to assign a numeric value outside of the target min/max limits SyntaxException (if an attempt is made to convert a string containing non-numeric characters to number)
In order to support efficient direct extraction of the held value, all specializations must additionally implement a public member function:
const T& value() const
returning a const reference to the actual stored value.
Inheritance
Direct Base Classes: VarHolder
All Base Classes: VarHolder
Member Summary
Member Functions: clone, type, value
Inherited Functions: clone, cloneHolder, convert, convertSignedFloatToUnsigned, convertSignedToUnsigned, convertToSmaller, convertToSmallerUnsigned, convertUnsignedToSigned, isArray, isBoolean, isDate, isDateTime, isDeque, isInteger, isList, isNumeric, isOrdered, isSigned, isString, isStruct, isTime, isUUID, isVector, size, type
Constructors
VarHolderImpl 
VarHolderImpl(
const T & val
);
Destructor
~VarHolderImpl 
~VarHolderImpl();
Member Functions
clone
VarHolder * clone(
Placeholder < VarHolder > * pVarHolder = 0
) const;
See also: Poco::Dynamic::VarHolder::clone()
type
const std::type_info & type() const;
See also: Poco::Dynamic::VarHolder::type()
value
const T & value() const;