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Slightly better comparison of row types for unions.

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Needs some work for non-static versions
This commit is contained in:
rbock 2016-10-10 22:25:16 +02:00
parent b0aa23ee87
commit fa0fe887b5
3 changed files with 53 additions and 6 deletions
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28
include/sqlpp11/field_spec.h
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@ -41,11 +41,39 @@ namespace sqlpp
using _nodes = detail::type_vector<>;
using _alias_t = NameType;
template <typename N, typename V, bool C, bool T>
static constexpr auto is_compatible(field_spec_t<N, V, C, T>) -> bool
{
using rhs = field_spec_t<N, V, C, T>;
return std::is_same<_traits, typename rhs::_traits>::value and
std::is_same<typename _alias_t::_name_t, typename rhs::_alias_t::_name_t>::value;
}
};
template <typename AliasProvider, typename FieldSpecTuple>
struct multi_field_spec_t
{
static_assert(wrong_t<AliasProvider, FieldSpecTuple>::value,
"multi_field_spec_t needs to be specialized with a tuple");
};
template <typename AliasProvider, typename... FieldSpecs>
struct multi_field_spec_t<AliasProvider, std::tuple<FieldSpecs...>>
{
template <typename A, typename... Fs>
static constexpr auto is_compatible(multi_field_spec_t<A, Fs...>) ->
typename std::enable_if<sizeof...(Fs) == sizeof...(FieldSpecs), bool>::type
{
return logic::all_t<FieldSpecs::is_compatible(Fs{})...>::value;
}
template <typename A, typename... Fs>
static constexpr auto is_compatible(multi_field_spec_t<A, Fs...>) ->
typename std::enable_if<sizeof...(Fs) != sizeof...(FieldSpecs), bool>::type
{
return false;
}
};
namespace detail

13
include/sqlpp11/result_row.h
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@ -186,6 +186,19 @@ namespace sqlpp
using _impl = detail::result_row_impl<Db, _field_index_sequence, FieldSpecs...>;
bool _is_valid;
template <typename D, typename... Fs>
static constexpr auto is_compatible(detail::type_vector<result_row_t<D, Fs...>>) ->
typename std::enable_if<sizeof...(Fs) == sizeof...(FieldSpecs), bool>::type
{
return logic::all_t<FieldSpecs::is_compatible(Fs{})...>::value;
}
template <typename D, typename... Fs>
static constexpr auto is_compatible(detail::type_vector<result_row_t<D, Fs...>>) ->
typename std::enable_if<sizeof...(Fs) != sizeof...(FieldSpecs), bool>::type
{
return false;
}
result_row_t() : _impl(), _is_valid(false)
{
}

18
include/sqlpp11/union.h
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@ -213,10 +213,13 @@ namespace sqlpp
static_assert(has_result_row_t<derived_statement_t<Policies>>::value,
"left hand side argument of a union has to be a complete select statement or union");
using _result_row_t = get_result_row_t<Rhs>;
static_assert(std::is_same<get_result_row_t<derived_statement_t<Policies>>, _result_row_t>::value,
using lhs_result_row_t = get_result_row_t<derived_statement_t<Policies>>;
using rhs_result_row_t = get_result_row_t<Rhs>;
static_assert(lhs_result_row_t::is_compatible(detail::type_vector<rhs_result_row_t>{}),
"both arguments in a union have to have the same result columns (type and name)");
static_assert(is_static_result_row_t<_result_row_t>::value, "unions must not have dynamically added columns");
static_assert(
is_static_result_row_t<lhs_result_row_t>::value && is_static_result_row_t<rhs_result_row_t>::value,
"unions must not have dynamically added columns");
return _union_impl<void, union_distinct_t>(check_union_t<derived_statement_t<Policies>, Rhs>{}, rhs);
}
@ -231,10 +234,13 @@ namespace sqlpp
static_assert(has_result_row_t<derived_statement_t<Policies>>::value,
"left hand side argument of a union has to be a (complete) select statement");
using _result_row_t = get_result_row_t<Rhs>;
static_assert(std::is_same<get_result_row_t<derived_statement_t<Policies>>, _result_row_t>::value,
using lhs_result_row_t = get_result_row_t<derived_statement_t<Policies>>;
using rhs_result_row_t = get_result_row_t<Rhs>;
static_assert(lhs_result_row_t::is_compatible(detail::type_vector<rhs_result_row_t>{}),
"both arguments in a union have to have the same result columns (type and name)");
static_assert(is_static_result_row_t<_result_row_t>::value, "unions must not have dynamically added columns");
static_assert(
is_static_result_row_t<lhs_result_row_t>::value && is_static_result_row_t<rhs_result_row_t>::value,
"unions must not have dynamically added columns");
return _union_impl<void, union_all_t>(check_union_t<derived_statement_t<Policies>, Rhs>{}, rhs);
}