SchemaMapperImpl.h

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// -*- lsst-c++ -*-
#ifndef AFW_TABLE_DETAIL_SchemaMapperImpl_h_INCLUDED
#define AFW_TABLE_DETAIL_SchemaMapperImpl_h_INCLUDED
 
#include <map>
#include <algorithm>
 
#include "lsst/afw/table/Key.h"
#include "lsst/afw/table/types.h"
#include "lsst/afw/table/Schema.h"
 
namespace lsst {
namespace afw {
namespace table {
 
class SchemaMapper;
 
namespace detail {

class SchemaMapperImpl final {
private:
    template <typename ...E>
    static std::variant<std::pair<Key<E>, Key<E>>...> makeKeyPairVariantType(TypeList<E...>);
 
public:
    using KeyPairVariant = decltype(makeKeyPairVariantType(FieldTypes{}));
    using KeyPairMap = std::vector<KeyPairVariant>;

    explicit SchemaMapperImpl(Schema const& input, Schema const& output) : _input(input), _output(output) {}
 
private:
    friend class table::SchemaMapper;
    friend class detail::Access;
 
    Schema _input;
    Schema _output;
    KeyPairMap _map;
};
}  // namespace detail
}  // namespace table
}  // namespace afw
}  // namespace lsst
 
#endif  // !AFW_TABLE_DETAIL_SchemaMapperImpl_h_INCLUDED