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Reduced error messages for select_flags

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rbock 2014-11-28 11:20:27 +01:00
parent 94be562167
commit f83d77ddb5
1 changed files with 20 additions and 9 deletions
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29
include/sqlpp11/select_flag_list.h
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@ -166,32 +166,43 @@ namespace sqlpp
struct _methods_t
{
using _database_t = typename Policies::_database_t;
template<typename T>
using _new_statement_t = new_statement<Policies, no_select_flag_list_t, T>;
template<typename... T>
using _check = detail::all_t<is_select_flag_t<T>::value...>;
template<typename Check, typename T>
using _new_statement_t = new_statement_t<Check::value, Policies, no_select_flag_list_t, T>;
using _consistency_check = consistent_t;
template<typename... Flags>
auto flags(Flags... flags) const
-> _new_statement_t<select_flag_list_t<void, Flags...>>
-> _new_statement_t<_check<Flags...>, select_flag_list_t<void, Flags...>>
{
return _flags_impl<void>(flags...);
static_assert(_check<Flags...>::value, "at least one argument is not a select flag in select flag list");
return _flags_impl<void>(_check<Flags...>{}, flags...);
}
template<typename... Flags>
auto dynamic_flags(Flags... flags) const
-> _new_statement_t<select_flag_list_t<_database_t, Flags...>>
-> _new_statement_t<_check<Flags...>, select_flag_list_t<_database_t, Flags...>>
{
static_assert(not std::is_same<_database_t, void>::value, "dynamic_flags must not be called in a static statement");
return _flags_impl<_database_t>(flags...);
static_assert(_check<Flags...>::value, "at least one argument is not a select flag in select flag list");
return _flags_impl<_database_t>(_check<Flags...>{}, flags...);
}
private:
template<typename Database, typename... Flags>
auto _flags_impl(Flags... flags) const
-> _new_statement_t<select_flag_list_t<Database, Flags...>>
auto _flags_impl(const std::false_type&, Flags... flags) const
-> bad_statement;
template<typename Database, typename... Flags>
auto _flags_impl(const std::true_type&, Flags... flags) const
-> _new_statement_t<std::true_type, select_flag_list_t<Database, Flags...>>
{
static_assert(detail::all_t<is_select_flag_t<Flags>::value...>::value, "at least one argument is not a select flag in select flag list");
static_assert(not detail::has_duplicates<Flags...>::value, "at least one duplicate argument detected in select flag list");
return { static_cast<const derived_statement_t<Policies>&>(*this), select_flag_list_data_t<Database, Flags...>{flags...} };