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76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
/*
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* Copyright (c) 2013-2015, 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_ALIAS_H
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#define SQLPP_ALIAS_H
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/serializer.h>
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namespace sqlpp
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{
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template <typename Expression, typename AliasProvider>
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struct expression_alias_t
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{
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using _traits = make_traits<value_type_of<Expression>, tag::is_selectable, tag::is_alias>;
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using _nodes = detail::type_vector<Expression>;
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static_assert(is_expression_t<Expression>::value, "invalid argument for an expression alias");
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static_assert(not is_alias_t<Expression>::value, "cannot create an alias of an alias");
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using _alias_t = typename AliasProvider::_alias_t;
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expression_alias_t(Expression expression) : _expression(expression)
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{
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}
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expression_alias_t(const expression_alias_t&) = default;
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expression_alias_t(expression_alias_t&&) = default;
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expression_alias_t& operator=(const expression_alias_t&) = default;
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expression_alias_t& operator=(expression_alias_t&&) = default;
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~expression_alias_t() = default;
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Expression _expression;
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};
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template <typename Context, typename Expression, typename AliasProvider>
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struct serializer_t<Context, expression_alias_t<Expression, AliasProvider>>
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{
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using _serialize_check = serialize_check_of<Context, Expression>;
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using T = expression_alias_t<Expression, AliasProvider>;
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static Context& _(const T& t, Context& context)
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{
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serialize_operand(t._expression, context);
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context << " AS ";
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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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}
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#endif
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