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CXXR (C++ R)
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Monitor function application for unary functions. More...
#include <UnaryFunction.hpp>
Public Types | |
| typedef Functor::argument_type | argument_type |
| typedef Functor::result_type | result_type |
Public Member Functions | |
| NullUnaryFunctorWrapper (const Functor &f) | |
| Constructor. | |
| result_type | operator() (const argument_type &in) const |
| Monitored invocation of f . | |
| void | warnings () |
| Raise warnings after processing a vector. | |
Monitor function application for unary functions.
VectorOps::UnaryFunction takes as a template parameter a FunctorWrapper class. The apply() method of UnaryFunction creates an object of the FunctorWrapper class, and delegates to it the task of calling the unary function; the FunctorWrapper object can then monitor any abnormal conditions that occur, and take appropriate action either immediately (typically by raising an error) or when processing of the input vector is complete (typically by providing one or more warnings).
This class is the default value of the FunctorWrapper template parameter, and its behaviour is to apply no monitoring at all. If different behaviour is required, another class can be created using this class as a model.
| Functor | a function object class inheriting from an instantiation of the std::unary_function template (or otherwise defining nested types result_type and argument_type appropriately). |
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Constructor.
| f | Pointer to an object of type Functor defining the unary function whose operation this FunctorWrapper is to monitor. |
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Monitored invocation of f .
The apply() method of an object instantiating the VectorOps::UnaryFunction template will call this function to generate a value for the output vector from a value from the input vector using the functor f . This function will monitor the operation of f , and take appropriate action if abnormalities occur, for example by raising an error, modifying the return value, and/or recording the abnormality for later reporting by warnings().
| in | Input value to which f is to be applied. |
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Raise warnings after processing a vector.
The apply() method of an object instantiating the VectorOps::UnaryFunction template will call this function once all the elements of the input vector have been processed. Typically this function will do nothing if no abnormalities have occurred during the lifetime of this FunctorWrapper object , otherwise it will raise one or more warnings. (Note that the lifetime of a FunctorWrapper object corresponds to the processing of an input vector by the apply() method of UnaryFunction.)
The default behaviour, implemented here, is to do nothing.
1.8.1