extract.h

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#ifndef cetlib_sqlite_detail_extract_h
#define cetlib_sqlite_detail_extract_h

// =================================================================
//
// For extraction operations, the following conversions are supported:
//
// .. std::string ==> std::string
//
//   (as specializations)
//
// .. std::string ==> int
// .. std::string ==> long
// .. std::string ==> long long
// .. std::string ==> unsigned
// .. std::string ==> unsigned long
// .. std::string ==> unsigned long long
// .. std::string ==> float
// .. std::string ==> double
// .. std::string ==> long double
//
// =================================================================

#include <string>

namespace cet::sqlite {
  namespace detail {

    template <typename T>
    inline auto
    convertTo(std::string const& arg)
    {
      return arg;
    }

    template <>
    inline auto
    convertTo<int>(std::string const& arg)
    {
      return std::stoi(arg);
    }
    template <>
    inline auto
    convertTo<long>(std::string const& arg)
    {
      return std::stol(arg);
    }
    template <>
    inline auto
    convertTo<long long>(std::string const& arg)
    {
      return std::stoll(arg);
    }
    template <>
    inline auto
    convertTo<unsigned>(std::string const& arg)
    {
      return std::stoul(arg);
    }
    template <>
    inline auto
    convertTo<unsigned long>(std::string const& arg)
    {
      return std::stoul(arg);
    }
    template <>
    inline auto
    convertTo<unsigned long long>(std::string const& arg)
    {
      return std::stoull(arg);
    }
    template <>
    inline auto
    convertTo<float>(std::string const& arg)
    {
      return std::stof(arg);
    }
    template <>
    inline auto
    convertTo<double>(std::string const& arg)
    {
      return std::stod(arg);
    }
    template <>
    inline auto
    convertTo<long double>(std::string const& arg)
    {
      return std::stold(arg);
    }

  } // detail
} // cet::sqlite

#endif /* cetlib_sqlite_detail_extract_h */

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// mode: c++
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