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Replaced field_spec_t::is_compatible function with a class template.

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Also removed two stand-alone union functions which did not work anyway.

Let's see if MSVC is happy now.
This commit is contained in:
rbock 2016-12-25 11:37:41 +01:00
parent 1b9a4b1594
commit fa8cb7b0af
3 changed files with 35 additions and 24 deletions
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55
include/sqlpp11/field_spec.h
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@ -41,17 +41,6 @@ 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<ValueType, V>::value and // We might need to know that float can hold int, too
(CanBeNull or CanBeNull == C) and // The left hand side determines the result row and therefore must allow
// NULL if the right hand side allows it
(NullIsTrivialValue or NullIsTrivialValue == T) and
std::is_same<typename _alias_t::_name_t, typename rhs::_alias_t::_name_t>::value;
}
};
template <typename AliasProvider, typename FieldSpecTuple>
@ -64,19 +53,39 @@ namespace sqlpp
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;
}
template <typename Left, typename Right, typename Enable = void>
struct is_field_compatible
{
static constexpr auto value = false;
};
template <typename LeftName,
typename LeftValue,
bool LeftCanBeNull,
bool LeftNullIsTrivial,
typename RightName,
typename RightValue,
bool RightCanBeNull,
bool RightNullIsTrivial>
struct is_field_compatible<field_spec_t<LeftName, LeftValue, LeftCanBeNull, LeftNullIsTrivial>,
field_spec_t<RightName, RightValue, RightCanBeNull, RightNullIsTrivial>>
{
static constexpr auto value =
std::is_same<typename LeftName::_name_t, typename RightName::_name_t>::value and
std::is_same<LeftValue, RightValue>::value and // Same value type
(LeftCanBeNull or !RightCanBeNull) and // The left hand side determines the result row and therefore must allow
// NULL if the right hand side allows it
(LeftNullIsTrivial or !RightNullIsTrivial); // as above
};
template <typename LeftAlias, typename... LeftFields, typename RightAlias, typename... RightFields>
struct is_field_compatible<multi_field_spec_t<LeftAlias, std::tuple<LeftFields...>>,
multi_field_spec_t<RightAlias, std::tuple<RightFields...>>,
typename std::enable_if<sizeof...(LeftFields) == sizeof...(RightFields)>::type>
{
static constexpr auto value = logic::all_t<is_field_compatible<LeftFields, RightFields>::value...>::value;
};
namespace detail

2
include/sqlpp11/result_row.h
View File

@ -262,7 +262,7 @@ namespace sqlpp
result_row_t<RDb, RFields...>,
typename std::enable_if<sizeof...(LFields) == sizeof...(RFields)>::type>
{
static constexpr auto value = logic::all_t<LFields::is_compatible(RFields{})...>::value;
static constexpr auto value = logic::all_t<is_field_compatible<LFields, RFields>::value...>::value;
};
template <typename Db, typename... FieldSpecs>

2
include/sqlpp11/union.h
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@ -253,6 +253,7 @@ namespace sqlpp
};
};
/*
template <typename T>
auto union_all(T&& t) -> decltype(statement_t<void, no_union_t>().union_all(std::forward<T>(t)))
{
@ -264,6 +265,7 @@ namespace sqlpp
{
return statement_t<void, no_union_t>().union_distinct(std::forward<T>(t));
}
*/
}
#endif