/usr/include/dune/functions/common/functionfromcallable.hh is in libdune-functions-dev 2.5.1-1.
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#ifndef DUNE_FUNCTIONS_COMMON_FUNCTION_FROM_CALLABLE_HH
#define DUNE_FUNCTIONS_COMMON_FUNCTION_FROM_CALLABLE_HH
#include <dune/common/function.hh>
#include <dune/functions/common/signature.hh>
namespace Dune {
namespace Functions {
template<class Signature, class F,
class FunctionInterface = typename Dune::VirtualFunction<
typename SignatureTraits<Signature>::RawDomain,
typename SignatureTraits<Signature>::RawRange> >
class FunctionFromCallable;
/**
* \brief Wrap a callable object as Dune::Function or Dune::VirtualFunction
*
* \ingroup FunctionUtility
*
* You can use this to implement a DifferentiableFunction including
* a variable number of derivatives using callable objects. All
* types that can be assigned to std::function<Range(Domain)> are supported,
* i.e. functions, functors, lambdas, ...
*
* \tparam Range Range type
* \tparam Domain Domain type
* \tparam F Type of wrapped function
* \tparam FunctionInterface Interface to implement, this can be either Dune::Function or Dune::VirtualFunction
*/
template<class Range, class Domain, class F, class FunctionInterface>
class FunctionFromCallable<Range(Domain), F, FunctionInterface> :
public FunctionInterface
{
public:
/**
* \brief Create VirtualFunction from callable object
*
* This will store the given function and pass evaluate()
* to its operator(). This constructor moves data
* from given function.
*
* \param f Callable object to use for evaluate()
*/
FunctionFromCallable(F&& f) :
f_(f)
{}
/**
* \brief Create VirtualFunction from callable object
*
* This will store the given function and pass evaluate()
* to its operator(). This constructor copies the given function.
*
* \param f Callable object to use for evaluate()
*/
FunctionFromCallable(const F& f) :
f_(f)
{}
/**
* \brief Evaluate function
*
* This call is passed to the function
*/
void evaluate(const Domain& x, Range&y) const
{
y = f_(x);
}
private:
F f_;
};
} // namespace Functions
} // namespace Dune
#endif //DUNE_FUNCTIONS_COMMON_FUNCTION_FROM_CALLABLE_HH
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