Library: Foundation
Package: Core
Header: Poco/DynamicAnyHolder.h
Description
Interface for a data holder used by the DynamicAny class. Provides methods to convert between data types. Only data types for which a convert method exists are supported, which are all C++ built-in types with addition of std::string, DateTime, LocalDateTime, Timestamp, and std::vector<DynamicAny>.
Inheritance
Known Derived Classes: DynamicAnyHolderImpl
Member Summary
Member Functions: clone, convert, convertSignedFloatToUnsigned, convertSignedToUnsigned, convertToSmaller, convertToSmallerUnsigned, convertUnsignedToSigned, isArray, isInteger, isNumeric, isSigned, isString, type
Constructors
DynamicAnyHolder
Creates the DynamicAnyHolder.
Destructor
~DynamicAnyHolder 
virtual ~DynamicAnyHolder();
Destroys the DynamicAnyHolder.
Member Functions
clone
virtual DynamicAnyHolder * clone() const = 0;
Deep-copies the DynamicAnyHolder.
convert
virtual void convert(
Int8 & val
) const = 0;
convert
virtual void convert(
Int16 & val
) const = 0;
convert
virtual void convert(
Int32 & val
) const = 0;
convert
virtual void convert(
Int64 & val
) const = 0;
convert
virtual void convert(
UInt8 & val
) const = 0;
convert
virtual void convert(
UInt16 & val
) const = 0;
convert
virtual void convert(
UInt32 & val
) const = 0;
convert
virtual void convert(
UInt64 & val
) const = 0;
convert
virtual void convert(
DateTime & val
) const = 0;
convert
virtual void convert(
LocalDateTime & val
) const = 0;
convert
virtual void convert(
Timestamp & val
) const = 0;
convert
virtual void convert(
bool & val
) const = 0;
convert
virtual void convert(
float & val
) const = 0;
convert
virtual void convert(
double & val
) const = 0;
convert
virtual void convert(
char & val
) const = 0;
convert
virtual void convert(
std::string & val
) const = 0;
isArray
virtual bool isArray() const = 0;
isInteger
virtual bool isInteger() const = 0;
isNumeric
virtual bool isNumeric() const = 0;
isSigned
virtual bool isSigned() const = 0;
isString
virtual bool isString() const = 0;
type
virtual const std::type_info & type() const = 0;
Returns the type information of the stored content.
convertSignedFloatToUnsigned 
template < typename F, typename T > void convertSignedFloatToUnsigned(
const F & from,
T & to
) const;
This function is meant for converting floating point data types to unsigned integral data types. Negative values can not be converted and if one is encountered, RangeException is thrown. If uper limit is within the target data type limits, the conversion is performed.
convertSignedToUnsigned
template < typename F, typename T > void convertSignedToUnsigned(
const F & from,
T & to
) const;
This function is meant for converting signed integral data types to unsigned data types. Negative values can not be converted and if one is encountered, RangeException is thrown. If upper limit is within the target data type limits, the conversion is performed.
convertToSmaller
template < typename F, typename T > void convertToSmaller(
const F & from,
T & to
) const;
This function is meant to convert signed numeric values from larger to smaller type. It checks the upper and lower bound and if from value is within limits of type T (i.e. check calls do not throw), it is converted.
convertToSmallerUnsigned
template < typename F, typename T > void convertToSmallerUnsigned(
const F & from,
T & to
) const;
This function is meant for converting unsigned integral data types, from larger to smaller type. Since lower limit is always 0 for unigned types, only the upper limit is checked, thus saving some cycles compared to the signed version of the function. If the value to be converted is smaller than the maximum value for the target type, the conversion is performed.
convertUnsignedToSigned
template < typename F, typename T > void convertUnsignedToSigned(
const F & from,
T & to
) const;
This function is meant for converting unsigned integral data types to unsigned data types. Negative values can not be converted and if one is encountered, RangeException is thrown. If upper limit is within the target data type limits, the converiosn is performed.