Library: Foundation
Package: Core
Header: Poco/DynamicAnyHolder.h
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>.
Known Derived Classes: DynamicAnyHolderImpl
Member Functions: clone, convert, convertSignedFloatToUnsigned, convertSignedToUnsigned, convertToSmaller, convertToSmallerUnsigned, convertUnsignedToSigned, isArray, isInteger, isNumeric, isSigned, isString, type
Creates the DynamicAnyHolder.
virtual ~DynamicAnyHolder();
Destroys the DynamicAnyHolder.
virtual DynamicAnyHolder * clone() const = 0;
Deep-copies the DynamicAnyHolder.
virtual void convert(
Int8 & val
) const = 0;
virtual void convert(
Int16 & val
) const = 0;
virtual void convert(
Int32 & val
) const = 0;
virtual void convert(
Int64 & val
) const = 0;
virtual void convert(
UInt8 & val
) const = 0;
virtual void convert(
UInt16 & val
) const = 0;
virtual void convert(
UInt32 & val
) const = 0;
virtual void convert(
UInt64 & val
) const = 0;
virtual void convert(
DateTime & val
) const = 0;
virtual void convert(
LocalDateTime & val
) const = 0;
virtual void convert(
Timestamp & val
) const = 0;
virtual void convert(
bool & val
) const = 0;
virtual void convert(
float & val
) const = 0;
virtual void convert(
double & val
) const = 0;
virtual void convert(
char & val
) const = 0;
virtual void convert(
std::string & val
) const = 0;
virtual bool isArray() const = 0;
virtual bool isInteger() const = 0;
virtual bool isNumeric() const = 0;
virtual bool isSigned() const = 0;
virtual bool isString() const = 0;
virtual const std::type_info & type() const = 0;
Returns the type information of the stored content.
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.
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.
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.
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.
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.