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Added tags missing and return_value

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missing indicates that a statement part has yet to be added (e.g.
columns in a select).

return_value indicates that a statement part can be used as a return
value.
This commit is contained in:
rbock 2014-05-19 06:42:45 +02:00
parent f314c6d070
commit e39444b0f7
4 changed files with 10 additions and 5 deletions
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3
include/sqlpp11/detail/type_set.h
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@ -157,6 +157,9 @@ namespace sqlpp
using type = typename make_type_set_if<Predicate, Rest...>::type::template insert_if<Predicate, T>::type;
};
template<template<typename> class Predicate, typename... T>
using make_type_set_if_t = typename make_type_set_if<Predicate, T...>::type;
template<template<typename> class Predicate, typename... T>
struct make_type_set_if_not
{

4
include/sqlpp11/select.h
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@ -145,9 +145,9 @@ namespace sqlpp
>::type;
using _value_type = typename std::conditional<
is_select_column_list_t<_column_list_t>::value and is_subset_of<required_tables_of<_column_list_t>, provided_tables_of<_from_t>>::value,
detail::make_type_set_if_t<is_missing_t, FlagList, ColumnList, From, ExtraTables, Where, GroupBy, Having, OrderBy, Limit, Offset>::size::value == 0,
value_type_of<_column_list_t>,
no_value_t // If something is selected that requires a table, then we require a from for this to be a value
no_value_t // if a required statement part is missing (columns in a select), then the statement cannot be used as a value
>::type;
using _traits = make_traits<_value_type>;

2
include/sqlpp11/type_traits.h
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@ -106,6 +106,8 @@ namespace sqlpp
SQLPP_IS_COLUMN_TRAIT_GENERATOR(trivial_value_is_null);
SQLPP_IS_VALUE_TRAIT_GENERATOR(noop);
SQLPP_IS_VALUE_TRAIT_GENERATOR(missing);
SQLPP_IS_VALUE_TRAIT_GENERATOR(return_value);
SQLPP_IS_VALUE_TRAIT_GENERATOR(table);
SQLPP_IS_VALUE_TRAIT_GENERATOR(join);
SQLPP_IS_VALUE_TRAIT_GENERATOR(pseudo_table);

6
include/sqlpp11/vendor/select_column_list.h vendored
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@ -47,14 +47,14 @@ namespace sqlpp
template<typename... Rest>
struct get_first_argument_if_unique
{
using _traits = make_traits<no_value_t, tag::select_column_list>;
using _traits = make_traits<no_value_t, tag::select_column_list, tag::return_value>;
struct _name_t {};
};
template<typename T>
struct get_first_argument_if_unique<T>
{
using _traits = make_traits<value_type_of<T>, tag::select_column_list, tag::expression, tag::named_expression>;
using _traits = make_traits<value_type_of<T>, tag::select_column_list, tag::return_value, tag::expression, tag::named_expression>;
using _name_t = typename T::_name_t;
};
}
@ -239,7 +239,7 @@ namespace sqlpp
{
struct no_select_column_list_t
{
using _traits = make_traits<no_value_t, ::sqlpp::tag::noop>;
using _traits = make_traits<no_value_t, ::sqlpp::tag::noop, ::sqlpp::tag::missing>;
using _recursive_traits = make_recursive_traits<>;
template<typename Db>