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Diffstat (limited to 'odb/mysql/traits.hxx')
| -rw-r--r-- | odb/mysql/traits.hxx | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/odb/mysql/traits.hxx b/odb/mysql/traits.hxx index 5418fa1..7f96c0b 100644 --- a/odb/mysql/traits.hxx +++ b/odb/mysql/traits.hxx @@ -162,6 +162,37 @@ namespace odb } }; + // Specialization for numeric enum representations (C++ enum, integer + // types, etc). In particular, this specialization works only for C++ + // enum type as long as its numeric value space starts with 0, is + // ascending and contiguous (i.e., the default enumerator assignment). + // + template <typename T> + struct default_value_traits<T, id_enum> + { + typedef T value_type; + typedef T query_type; + typedef unsigned short image_type; + + static void + set_value (T& v, unsigned short i, bool is_null) + { + // In MySQL first enumerator has index 1. + // + if (!is_null) + v = static_cast<T> (i - 1); + else + v = T (); + } + + static void + set_image (unsigned short& i, bool& is_null, const T& v) + { + is_null = false; + i = static_cast<unsigned short> (v) + 1; + } + }; + // std::string specialization. // class LIBODB_MYSQL_EXPORT string_value_traits |