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AbstractUserFunction

Base class for user functions. More...

#include <xpress.hpp>

Inheritance diagram for xpress::XPRSProblem::AbstractUserFunction:
xpress::XPRSProblem::MapDeltaFunction xpress::XPRSProblem::MapFunction xpress::XPRSProblem::MultiMapDeltaFunction xpress::XPRSProblem::MultiMapFunction xpress::XPRSProblem::VecMapDeltaFunction xpress::XPRSProblem::VecMapFunction

Public Member Functions
virtual auto  call (int output, std::vector< xpress::objects::Expression > arguments) -> xpress::objects::Expression=0
  Create an expression that represents a symbolic call to this function.
 
auto  call (std::vector< xpress::objects::Expression > arguments) -> xpress::objects::Expression
  Create an expression that represents a symbolic call to this function.
 
virtual auto  evaluate (int output, xpress::SizedArray< double const > const &args) -> double=0
  Evaluate this function for the given values.
 
auto  evaluate (xpress::SizedArray< double const > const &args) -> double
  Shorthand for evaluate(1, args).
 
auto  getId () -> int
  Get the id for this function.
 
auto  getName () const -> std::string
  Get the name with which the function was registered.
 
virtual auto  isMultiOutput () -> bool=0
  Check whether this is a function that produces more than one value for a single call.
 
auto  triggerEvalError (std::exception_ptr e) -> void
  Trigger a user function evaluation error with a specific exception.
 

Detailed Description

Base class for user functions.

You will usually not have to create an instance of this class or its subclasses yourself. Instead the way to create an instance is to use an XPRSProblem instance as factory: 

       MapFunction f = prob->nlpAddUserFunction("myf", 0, d -> 2 * d);

That is, you create an instance of MapFunctor, VecMapFunctor, MultiMapFunctor, MapDeltaFunctor, VecMapDeltaFunctor, or MultiMapDeltaFunctor and then pass that to the appropriate overload of nlpAddUserFunction. This will register the function with the Xpress problem object and return a user function instance that can then be used in the code to build formulas.

Since
44.00

Member Function Documentation

call() [1/2]

virtual auto xpress::XPRSProblem::AbstractUserFunction::call ( int output,
std::vector< xpress::objects::Expression > arguments ) -> xpress::objects::Expression
pure virtual

Create an expression that represents a symbolic call to this function.

Parameters
output If this is a multi-output function then this specifies which output to select. Note that the first output has index 1!
arguments Arguments for the function call.
Returns
The expression representing a call to this function.
Since
44.00

Implemented in xpress::XPRSProblem::MapDeltaFunction, xpress::XPRSProblem::MapFunction, xpress::XPRSProblem::MultiMapDeltaFunction, xpress::XPRSProblem::MultiMapFunction, xpress::XPRSProblem::VecMapDeltaFunction, and xpress::XPRSProblem::VecMapFunction.

call() [2/2]

auto xpress::XPRSProblem::AbstractUserFunction::call ( std::vector< xpress::objects::Expression > arguments ) -> xpress::objects::Expression
inline

Create an expression that represents a symbolic call to this function.

Shorthand for call(1, arguments).

Parameters
arguments Arguments to function call.
Returns
The expression.
Since
44.00

evaluate() [1/2]

virtual auto xpress::XPRSProblem::AbstractUserFunction::evaluate ( int output,
xpress::SizedArray< double const > const & args ) -> double
pure virtual

Evaluate this function for the given values.

Parameters
output Output selector. In case the function returns multiple outputs then this selects which of them to return. Otherwise this argument is ignored. Note that the first output has index 1!
args Arguments for the function call.
Returns
The result.
Since
44.00

Implemented in xpress::XPRSProblem::MapDeltaFunction, xpress::XPRSProblem::MapFunction, xpress::XPRSProblem::MultiMapDeltaFunction, xpress::XPRSProblem::MultiMapFunction, xpress::XPRSProblem::VecMapDeltaFunction, and xpress::XPRSProblem::VecMapFunction.

evaluate() [2/2]

auto xpress::XPRSProblem::AbstractUserFunction::evaluate ( xpress::SizedArray< double const > const & args ) -> double
inline

Shorthand for evaluate(1, args).

Parameters
args Arguments for the function call.
Returns
The result.
Since
44.00

getId()

auto xpress::XPRSProblem::AbstractUserFunction::getId ( ) -> int
inline

Get the id for this function.

The id is used to identify this function in formulas that are specified as token/value arrays.

Returns
This function's id.
Since
44.00

getName()

auto xpress::XPRSProblem::AbstractUserFunction::getName ( ) const -> std::string
inline

Get the name with which the function was registered.

Returns
This function's name.
Since
44.00

isMultiOutput()

virtual auto xpress::XPRSProblem::AbstractUserFunction::isMultiOutput ( ) -> bool
pure virtual

Check whether this is a function that produces more than one value for a single call.

Returns
true if the function has more than one output, false otherwise.
Since
44.00

Implemented in xpress::XPRSProblem::MapDeltaFunction, xpress::XPRSProblem::MapFunction, xpress::XPRSProblem::MultiMapDeltaFunction, xpress::XPRSProblem::MultiMapFunction, xpress::XPRSProblem::VecMapDeltaFunction, and xpress::XPRSProblem::VecMapFunction.

triggerEvalError()

auto xpress::XPRSProblem::AbstractUserFunction::triggerEvalError ( std::exception_ptr e ) -> void
inline

Trigger a user function evaluation error with a specific exception.

Captures e, stops the optimization and re-raises e when the call to the current optimization function returns. If this function is called more than once for a single invocation of an optimization function then only the exception from the first call is captured/re-raised.

Parameters
e The exception that caused the user function to fail.
Since
44.00
The documentation for this class was generated from the following file:
  • xpress.hpp
Parent Topic XPRSProblem

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