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| -rw-r--r-- | odb/c-array-traits.hxx | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/odb/c-array-traits.hxx b/odb/c-array-traits.hxx new file mode 100644 index 0000000..1acc0d7 --- /dev/null +++ b/odb/c-array-traits.hxx @@ -0,0 +1,102 @@ +// file : odb/c-array-traits.hxx +// copyright : Copyright (c) 2009-2019 Code Synthesis Tools CC +// license : GNU GPL v2; see accompanying LICENSE file + +#ifndef ODB_C_ARRAY_TRAITS_HXX +#define ODB_C_ARRAY_TRAITS_HXX + +#include <odb/pre.hxx> + +#include <cstddef> // std::size_t +#include <cassert> + +#include <odb/container-traits.hxx> + +namespace odb +{ + // Optional mapping of C arrays as containers. Note that this mapping is not + // enable by default. To enable, pass the following options to the ODB + // compiler: + // + // --odb-epilogue '#include <odb/c-array-traits.hxx>' + // --hxx-prologue '#include <odb/c-array-traits.hxx>' + // + // Note also that the array types have to be named, for example: + // + // class object + // { + // // composite_type values[5]; // Won't work. + // + // typedef composite_type composite_array[5]; + // composite_array values; + // }; + // + // Finally, this mapping is disabled for the char[N] and wchar_t[N] types + // (they are mapped as strings by default). + // + template <typename V, std::size_t N> + class access::container_traits<V[N]> + { + public: + static const container_kind kind = ck_ordered; + static const bool smart = false; + + typedef V container_type[N]; + + typedef V value_type; + typedef std::size_t index_type; + + typedef ordered_functions<index_type, value_type> functions; + + public: + static void + persist (const container_type& c, const functions& f) + { + for (index_type i (0); i < N; ++i) + f.insert (i, c[i]); + } + + static void + load (container_type& c, bool more, const functions& f) + { + index_type i (0); + + for (; more && i < N; ++i) + { + index_type dummy; + more = f.select (dummy, c[i]); + } + + assert (!more && i == N); + } + + static void + update (const container_type& c, const functions& f) + { + f.delete_ (); + + for (index_type i (0); i < N; ++i) + f.insert (i, c[i]); + } + + static void + erase (const functions& f) + { + f.delete_ (); + } + }; + + // Disable for char[N] and wchar_t[N]. + // + template <std::size_t N> + class access::container_traits<char[N]>; + +#ifdef _WIN32 + template <std::size_t N> + class access::container_traits<wchar_t[N]>; +#endif +} + +#include <odb/post.hxx> + +#endif // ODB_C_ARRAY_TRAITS_HXX |