common/context.h

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#ifndef GRPPI_COMMON_CONTEXT_H
#define GRPPI_COMMON_CONTEXT_H

#include <type_traits>

namespace grppi {

template <typename ExecutionPolicy, typename Transformer>
class context_t {
public:

  using transformer_type = Transformer;
  using execution_policy_type = ExecutionPolicy;

  context_t(ExecutionPolicy & e, Transformer && t) noexcept :
    execution_policy_{e}, transformer_{t}
  {}

  ExecutionPolicy & execution_policy(){
    return execution_policy_;
  }
  

  Transformer & transformer(){
    return transformer_;
  }

  template <typename I>
  auto operator()(I && item) const {
    return transformer_(std::forward<I>(item));
  }

private:
  Transformer transformer_;
  ExecutionPolicy& execution_policy_;
};

namespace internal {

template<typename T>
struct is_context : std::false_type {};

template<typename E, typename T>
struct is_context<context_t<E,T>> : std::true_type {};

} // namespace internal

template <typename T>
static constexpr bool is_context = internal::is_context<std::decay_t<T>>();

template <typename T>
using requires_context = typename std::enable_if_t<is_context<T>, int>;

}

#endif