SequenceAccumulate

Accumulate over all elements of a sequence using functors. More...

Modules
	SequenceAccumulateFunctors
	Pre-defined functors as argument to the AccumulateSequence template.

Typedefs
template<class F , class Seq >
using	Dune::ACFem::AccumulateSequence = Constant< typename Seq::value_type, AccumulateSequenceHelper< Seq, F >::value >
	Accumulate the values of the sequence according to the supplied functor. More...

Detailed Description

Accumulate over all elements of a sequence using functors.

Typedef Documentation

AccumulateSequence

template<class F , class Seq >

using Dune::ACFem::AccumulateSequence = typedef Constant<typename Seq::value_type, AccumulateSequenceHelper<Seq, F>::value>

Accumulate the values of the sequence according to the supplied functor.

The functor must define an "Apply"-template of the following type, where the neutralValue is the result value for the empty sequence and the value the last element of the sequence will be combined with. Front is the current element, Tail the resulting value obtained by accumulating the rest of the sequence. T will be TYPE when instantiating the Apply alias.

struct Functor
{
  template<class T>
  using NeutralValue = Constant<T, SOMETHING>;
 
  template<class T, T Front, T Tail>
  using Apply = IntegerConstant<TYPE, EXPRESSION(Front, Tail)>;
};

Note

AccumulateSequence is rather general. For simple things it is probably better to use the builtin fold expressions of the compiler.