mirror of
https://github.com/rbock/sqlpp11.git
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220 lines
8.4 KiB
C++
220 lines
8.4 KiB
C++
/*
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* Copyright (c) 2013-2014, Roland Bock
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SQLPP_CTE_H
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#define SQLPP_CTE_H
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#include <sqlpp11/union_data.h>
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#include <sqlpp11/select_flags.h>
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#include <sqlpp11/result_row.h>
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#include <sqlpp11/statement_fwd.h>
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/parameter_list.h>
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#include <sqlpp11/expression.h>
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#include <sqlpp11/interpret_tuple.h>
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#include <sqlpp11/interpretable_list.h>
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#include <sqlpp11/logic.h>
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namespace sqlpp
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{
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template<typename AliasProvider, typename Statement, typename... FieldSpecs>
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struct cte_t;
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template<typename FieldSpec>
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struct cte_column_spec_t
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{
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using _alias_t = typename FieldSpec::_alias_t;
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using _traits = make_traits<value_type_of<FieldSpec>,
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tag::must_not_insert,
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tag::must_not_update,
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tag_if<tag::can_be_null, column_spec_can_be_null_t<FieldSpec>::value>
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>;
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};
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template<typename AliasProvider, typename Statement, typename ResultRow>
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struct make_cte_impl
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{
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using type = void;
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};
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template<typename AliasProvider, typename Statement, typename... FieldSpecs>
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struct make_cte_impl<AliasProvider, Statement, result_row_t<void, FieldSpecs...>>
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{
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using type = cte_t<AliasProvider, Statement, FieldSpecs...>;
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};
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template<typename AliasProvider, typename Statement>
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using make_cte_t = typename make_cte_impl<AliasProvider, Statement, get_result_row_t<Statement>>::type;
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template<typename AliasProvider, typename Statement, typename... FieldSpecs>
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struct cte_t: public member_t<cte_column_spec_t<FieldSpecs>, column_t<AliasProvider, cte_column_spec_t<FieldSpecs>>>...
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{
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using _traits = make_traits<no_value_t, tag::is_cte, tag::is_table>; // FIXME: is table? really?
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struct _recursive_traits
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{
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using _required_ctes = detail::make_joined_set_t<required_ctes_of<Statement>, detail::make_type_set_t<AliasProvider>>;
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using _provided_ctes = detail::type_set<>;
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using _required_tables = detail::type_set<>;
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using _provided_tables = detail::type_set<AliasProvider>;
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using _provided_outer_tables = detail::type_set<>;
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using _extra_tables = detail::type_set<>;
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using _parameters = parameters_of<Statement>;
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using _tags = detail::type_set<>;
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};
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using _alias_t = typename AliasProvider::_alias_t;
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using _column_tuple_t = std::tuple<column_t<AliasProvider, cte_column_spec_t<FieldSpecs>>...>;
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template<typename... T>
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using _check = logic::all_t<is_statement_t<T>::value...>;
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template<typename Rhs>
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auto union_distinct(Rhs rhs) const
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-> typename std::conditional<_check<Rhs>::value, cte_t<AliasProvider, union_data_t<void, distinct_t, Statement, Rhs>, FieldSpecs...>, bad_statement>::type
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{
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static_assert(is_statement_t<Rhs>::value, "argument of union call has to be a statement");
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static_assert(has_policy_t<Rhs, is_select_t>::value, "argument of union call has to be a select");
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static_assert(has_result_row_t<Rhs>::value, "argument of a union has to be a (complete) select statement");
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using _result_row_t = result_row_t<void, FieldSpecs...>;
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static_assert(std::is_same<_result_row_t, get_result_row_t<Rhs>>::value, "both select statements in a union have to have the same result columns (type and name)");
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return _union_impl<void, distinct_t>(_check<Rhs>{}, rhs);
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}
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template<typename Rhs>
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auto union_all(Rhs rhs) const
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-> typename std::conditional<_check<Rhs>::value, cte_t<AliasProvider, union_data_t<void, all_t, Statement, Rhs>, FieldSpecs...>, bad_statement>::type
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{
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static_assert(is_statement_t<Rhs>::value, "argument of union call has to be a statement");
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static_assert(has_policy_t<Rhs, is_select_t>::value, "argument of union call has to be a select");
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static_assert(has_result_row_t<Rhs>::value, "argument of a union has to be a (complete) select statement");
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using _result_row_t = result_row_t<void, FieldSpecs...>;
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static_assert(std::is_same<_result_row_t, get_result_row_t<Rhs>>::value, "both select statements in a union have to have the same result columns (type and name)");
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return _union_impl<void, all_t>(_check<Rhs>{}, rhs);
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}
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private:
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template<typename Database, typename Flag, typename Rhs>
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auto _union_impl(const std::false_type&, Rhs rhs) const
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-> bad_statement;
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template<typename Database, typename Flag, typename Rhs>
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auto _union_impl(const std::true_type&, Rhs rhs) const
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-> cte_t<AliasProvider, union_data_t<void, Flag, Statement, Rhs>, FieldSpecs...>
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{
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return union_data_t<Database, Flag, Statement, Rhs>{_statement, rhs};
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}
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public:
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cte_t(Statement statement): _statement(statement){}
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cte_t(const cte_t&) = default;
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cte_t(cte_t&&) = default;
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cte_t& operator=(const cte_t&) = default;
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cte_t& operator=(cte_t&&) = default;
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~cte_t() = default;
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Statement _statement;
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};
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template<typename Context, typename AliasProvider, typename Statement, typename... ColumnSpecs>
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struct serializer_t<Context, cte_t<AliasProvider, Statement, ColumnSpecs...>>
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{
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using _serialize_check = serialize_check_of<Context, Statement>;
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using T = cte_t<AliasProvider, Statement, ColumnSpecs...>;
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static Context& _(const T& t, Context& context)
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{
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context << name_of<T>::char_ptr() << " AS (";
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serialize(t._statement, context);
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context << ")";
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return context;
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}
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};
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// The cte_t is displayed as AliasProviderName except within the with:
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// - the with needs the
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// AliasProviderName AS (ColumnNames) (select/union)
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// The result row of the select should not have dynamic parts
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template<typename AliasProvider>
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struct pre_cte_t
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{
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using _traits = make_traits<no_value_t, tag::is_cte, tag::is_table>; // FIXME: is table? really?
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struct _recursive_traits
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{
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using _required_ctes = detail::make_type_set_t<AliasProvider>;
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using _provided_ctes = detail::type_set<>;
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using _required_tables = detail::type_set<>;
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using _provided_tables = detail::type_set<AliasProvider>;
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using _provided_outer_tables = detail::type_set<>;
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using _extra_tables = detail::type_set<>;
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using _parameters = std::tuple<>;
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using _tags = detail::type_set<>;
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};
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using _alias_t = typename AliasProvider::_alias_t;
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template<typename Statement>
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auto as(Statement statement)
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-> make_cte_t<AliasProvider, Statement>
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{
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static_assert(required_tables_of<Statement>::size::value == 0, "common table expression must not use unknown tables");
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static_assert(not detail::is_element_of<AliasProvider, required_ctes_of<Statement>>::value, "common table expression must not self-reference in the first part, use union_all/union_distinct for recursion");
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static_assert(is_static_result_row_t<get_result_row_t<Statement>>::value, "ctes must not have dynamically added columns");
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return { statement };
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}
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};
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template<typename Context, typename AliasProvider>
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struct serializer_t<Context, pre_cte_t<AliasProvider>>
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{
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using _serialize_check = consistent_t;
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using T = pre_cte_t<AliasProvider>;
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static Context& _(const T& t, Context& context)
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{
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context << name_of<T>::char_ptr();
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return context;
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}
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};
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template<typename AliasProvider>
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auto cte(const AliasProvider&)
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-> pre_cte_t<AliasProvider>
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{
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return {};
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}
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}
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#endif
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