Program Listing for File concepts.hpp

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#pragma once

/*******************************************************************************
 * Includes
 ******************************************************************************/
#include "rcppsw/rcppsw.hpp"

/*******************************************************************************
 * Namespaces/Decls
 ******************************************************************************/
namespace rcppsw::mpl {

/*******************************************************************************
 * Concepts
 ******************************************************************************/
template<typename T>
concept is_mappish = requires(T& v) {
  typename std::void_t<typename T::key_type,
              typename T::mapped_type,
              decltype(std::declval<T&>()[std::declval<
                                          const typename T::key_type&>()])>;

};

} /* namespace rcppsw */