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74cafe35dd
Before this, there could be multiple classes representing multiple id columns. Now there is one class representing ALL the name "id". Very important for analyzing potential name clashes.
94 lines
2.8 KiB
C++
94 lines
2.8 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_MIN_H
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#define SQLPP_MIN_H
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/char_sequence.h>
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namespace sqlpp
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{
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template<typename Expr>
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struct min_t:
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public expression_operators<min_t<Expr>, value_type_of<Expr>>,
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public alias_operators<min_t<Expr>>
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{
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using _traits = make_traits<value_type_of<Expr>, tag::is_expression, tag::is_selectable>;
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using _recursive_traits = make_recursive_traits<Expr, aggregate_function>;
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struct _alias_t
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{
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static constexpr const char _literal[] = "min_";
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using _name_t = sqlpp::make_char_sequence<sizeof(_literal), _literal>;
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template<typename T>
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struct _member_t
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{
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T min;
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T& operator()() { return min; }
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const T& operator()() const { return min; }
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};
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};
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min_t(Expr expr):
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_expr(expr)
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{}
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min_t(const min_t&) = default;
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min_t(min_t&&) = default;
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min_t& operator=(const min_t&) = default;
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min_t& operator=(min_t&&) = default;
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~min_t() = default;
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Expr _expr;
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};
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template<typename Context, typename Expr>
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struct serializer_t<Context, min_t<Expr>>
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{
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using _serialize_check = serialize_check_of<Context, Expr>;
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using T = min_t<Expr>;
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static Context& _(const T& t, Context& context)
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{
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context << "MIN(";
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serialize(t._expr, context);
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context << ")";
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return context;
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}
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};
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template<typename T>
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auto min(T t) -> min_t<wrap_operand_t<T>>
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{
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static_assert(is_expression_t<wrap_operand_t<T>>::value, "min() requires an expression as argument");
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return { t };
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}
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}
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#endif
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