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Started to rewrite traits and recursive traits

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traits are shorter and easier to identify by using tags in a variadic
template

recursive traits can be automatically derived, which makes it much
easier to add new traits to be handed through the expression tree.
This commit is contained in:
rbock
2014-05-15 08:00:03 +02:00
parent df3fd999b3
commit d062c1a0d8
51 changed files with 218 additions and 224 deletions
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13
include/sqlpp11/table_alias.h
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@@ -41,16 +41,17 @@ namespace sqlpp
struct table_alias_t: public table_alias_base_t, public ColumnSpec::_name_t::template _member_t<column_t<AliasProvider, ColumnSpec>>...
{
//FIXME: Need to add join functionality
using _is_table = std::true_type;
using _table_set = detail::type_set<AliasProvider>;
using _traits = make_traits_t<value_type_of<Table>, tag::table, tag::alias, tag::named_expression_if<tag::is_expression<Table>>;
struct _value_type: Table::_value_type
struct _recursive_traits
{
using _is_expression = std::false_type;
using _is_named_expression = copy_type_trait<Table, is_value_t>;
using _is_alias = std::true_type;
using _parameters = std::tuple<>;
using _required_tables = detail::type_set<>;
using _provided_tables = detail::type_set<Table>;
};
static_assert(Table::_required_tables::size::value == 0, "table aliases must not depend on external tables");
using _name_t = typename AliasProvider::_name_t;
using _column_tuple_t = std::tuple<column_t<Table, ColumnSpec>...>;