Tpetra_Assembly_Helpers.hpp

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#ifndef TPETRA_ASSEMBLY_HELPERS_HPP
#define TPETRA_ASSEMBLY_HELPERS_HPP

namespace Tpetra {

namespace Impl {
// Helper function to to apply an operation to each member of  a
// c++11 parameter pack since parameter expansion only happens
// within functions, constructors, and initializer_lists
template <typename... Args>
inline void foreach_pack(Args &&... args) {}
} // namespace Impl

template <typename... Args>
void beginFill(Args &&... args)
{
  // use the comma operator to transform a potentially void function call
  // into a argument to allow proper parameter expansion for c++11
  Impl::foreach_pack( (args.beginFill(),1)... );

  // using c++17 the code would be
  // (args.beginFill()...);
}

template <typename... Args>
void endFill(Args &&... args)
{
  // use the comma operator to transform a potentially void function call
  // into a argument to allow proper parameter expansion for c++11
  Impl::foreach_pack( (args.endFill(),1)... );

  // using c++17 the code would be
  // (args.endFill()...);

}

}// namespace Tpetra

#endif // TPETRA_ASSEMBLY_HELPERS_HPP