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Use name tag instead of the whole name tag provider in paramters

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This commit is contained in:
Roland Bock 2024-11-03 11:45:34 +01:00
parent dc53fd5acc
commit 25879d1dc0
2 changed files with 15 additions and 20 deletions
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33
include/sqlpp11/core/basic/parameter.h
View File

@ -34,15 +34,9 @@
namespace sqlpp
{
#warning: It would be sufficient to store the NameTag here, not the whole NameTagProvider
template <typename ValueType, typename NameType>
struct parameter_t : public enable_comparison<parameter_t<ValueType, NameType>>
template <typename ValueType, typename NameTag>
struct parameter_t : public enable_comparison<parameter_t<ValueType, NameTag>>
{
using _traits = make_traits<ValueType, tag::is_parameter, tag::is_expression>;
using _is_literal_expression = std::true_type;
using _instance_t = member_t<NameType, parameter_value_t<ValueType>>;
parameter_t() = default;
parameter_t(const parameter_t&) = default;
@ -52,31 +46,32 @@ namespace sqlpp
~parameter_t() = default;
};
template<typename ValueType, typename NameType>
struct parameters_of<parameter_t<ValueType, NameType>>
template<typename ValueType, typename NameTag>
struct parameters_of<parameter_t<ValueType, NameTag>>
{
using type = detail::type_vector<parameter_t<ValueType, NameType>>;
using type = detail::type_vector<parameter_t<ValueType, NameTag>>;
};
template<typename ValueType, typename NameType>
struct value_type_of<parameter_t<ValueType, NameType>>
template<typename ValueType, typename NameTag>
struct value_type_of<parameter_t<ValueType, NameTag>>
{
using type = ValueType;
};
template <typename ValueType, typename NameType>
struct name_tag_of<parameter_t<ValueType, NameType>> : public name_tag_of<NameType>
template <typename ValueType, typename NameTag>
struct name_tag_of<parameter_t<ValueType, NameTag>>
{
using type = NameTag;
};
template <typename Context, typename ValueType, typename NameType>
auto to_sql_string(Context& , const parameter_t<ValueType, NameType>&) -> std::string
template <typename Context, typename ValueType, typename NameTag>
auto to_sql_string(Context& , const parameter_t<ValueType, NameTag>&) -> std::string
{
return "?";
}
template <typename NamedExpr>
auto parameter(const NamedExpr & /*unused*/) -> parameter_t<value_type_of_t<NamedExpr>, NamedExpr>
auto parameter(const NamedExpr & /*unused*/) -> parameter_t<value_type_of_t<NamedExpr>, name_tag_of_t<NamedExpr>>
{
static_assert(is_selectable_t<NamedExpr>::value, "not a named expression");
return {};
@ -84,7 +79,7 @@ namespace sqlpp
template <typename ValueType, typename NameTagProvider>
auto parameter(const ValueType& /*unused*/, const NameTagProvider & /*unused*/)
-> parameter_t<value_type_of_t<ValueType>, NameTagProvider>
-> parameter_t<value_type_of_t<ValueType>, name_tag_of_t<NameTagProvider>>
{
static_assert(has_value_type<ValueType>::value, "first argument is not a value type");
static_assert(has_name_tag<NameTagProvider>::value, "second argument does not have a name");

2
tests/core/types/clause/cte.cpp
View File

@ -83,7 +83,7 @@ void test_cte()
static_assert(std::is_same<sqlpp::parameters_of_t<X>, sqlpp::detail::type_vector<P>>::value, "");
// CTE reference is what is stored in from_t or join_t.
// While it refers to a CTE, it cannot be used as a CTE or table, i.e. with(rx) or from(ra) would not compile.
// While it refers to a CTE, it cannot be used as a CTE or table, i.e. with(rx) or from(rx) would not compile.
static_assert(not sqlpp::is_cte<RX>::value, "");
static_assert(not sqlpp::is_table<RX>::value, "");
static_assert(sqlpp::parameters_of_t<RX>::empty(), "");