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, convert, isArray, isBoolean, isInteger, isNumeric, isSigned, isString, isStruct, operator =, type, value
Inherited Functions: clone, cloneHolder, convert, convertSignedFloatToUnsigned, convertSignedToUnsigned, convertToFP, convertToSigned, convertToSmaller, convertToSmallerUnsigned, convertToUnsigned, convertUnsignedToSigned, isArray, isBoolean, isDate, isDateTime, isDeque, isInteger, isList, isNumeric, isOrdered, isSigned, isString, isStruct, isTime, isUUID, isVector, size, type
Constructors
VarHolderImpl
VarHolderImpl() = delete;
VarHolderImpl 
VarHolderImpl(
const T & val
);
VarHolderImpl
VarHolderImpl(
const VarHolderImpl & param248
) = delete;
Destructor
~VarHolderImpl 
~VarHolderImpl() override = default;
Member Functions
clone
VarHolder * clone(
Placeholder < VarHolder > * pVarHolder = nullptr
) const override;
See also: Poco::Dynamic::VarHolder::clone()
convert
void convert(
Int8 & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
convert
void convert(
Int16 & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
convert
void convert(
Int32 & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
convert
void convert(
Int64 & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
convert
void convert(
UInt8 & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
convert
void convert(
UInt16 & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
convert
void convert(
UInt32 & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
convert
void convert(
UInt64 & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
convert
void convert(
long long & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
convert
void convert(
unsigned long long & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
convert
void convert(
bool & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
convert
void convert(
float & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
convert
void convert(
double & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
convert
void convert(
char & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
convert
void convert(
std::string & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
convert
void convert(
Poco::UTF16String & val
) const override;
See also: Poco::Dynamic::VarHolder::convert()
isArray
bool isArray() const override;
See also: Poco::Dynamic::VarHolder::isArray()
isBoolean
bool isBoolean() const override;
See also: Poco::Dynamic::VarHolder::isBoolean()
isInteger
bool isInteger() const override;
See also: Poco::Dynamic::VarHolder::isInteger()
isNumeric
bool isNumeric() const override;
See also: Poco::Dynamic::VarHolder::isNumeric()
isSigned
bool isSigned() const override;
See also: Poco::Dynamic::VarHolder::isSigned()
isString
bool isString() const override;
See also: Poco::Dynamic::VarHolder::isString()
isStruct
bool isStruct() const override;
See also: Poco::Dynamic::VarHolder::isStruct()
operator =
VarHolderImpl & operator = (
const VarHolderImpl & param249
) = delete;
type
const std::type_info & type() const override;
See also: Poco::Dynamic::VarHolder::type()
value
const T & value() const;