statement_parameters.hxx

#ifndef PQXX_H_STATEMENT_PARAMETER
#define PQXX_H_STATEMENT_PARAMETER

#include <cstring>
#include <iterator>
#include <string>
#include <vector>

#include "pqxx/binarystring.hxx"
#include "pqxx/strconv.hxx"
#include "pqxx/util.hxx"


namespace pqxx::internal
{
template<typename ITERATOR>
constexpr inline auto const iterator_identity{
  [](decltype(*std::declval<ITERATOR>()) x) { return x; }};


template<typename IT, typename ACCESSOR = decltype(iterator_identity<IT>)>
class dynamic_params
{
public:
  constexpr dynamic_params(IT begin, IT end) :
          m_begin(begin), m_end(end), m_accessor(iterator_identity<IT>)
  {}


  constexpr dynamic_params(IT begin, IT end, ACCESSOR &acc) :
          m_begin(begin), m_end(end), m_accessor(acc)
  {}

  template<typename C>
  explicit constexpr dynamic_params(C &container) :
          dynamic_params(std::begin(container), std::end(container))
  {}


  template<typename C>
  explicit constexpr dynamic_params(C &container, ACCESSOR &acc) :
          dynamic_params(std::begin(container), std::end(container), acc)
  {}

  constexpr IT begin() const noexcept { return m_begin; }
  constexpr IT end() const noexcept { return m_end; }

  constexpr auto access(decltype(*std::declval<IT>()) value) const
    -> decltype(std::declval<ACCESSOR>()(value))
  {
    return m_accessor(value);
  }

private:
  IT const m_begin, m_end;
  ACCESSOR m_accessor = iterator_identity<IT>;
};



struct PQXX_LIBEXPORT c_params
{
  c_params() = default;
  c_params(c_params const &) = delete;
  c_params(c_params &&) = default;

  void reserve(std::size_t n) &;

  std::vector<char const *> values;
  std::vector<int> lengths;
  std::vector<format> formats;
};
} // namespace pqxx::internal
#endif