mirror of
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101 lines
3.1 KiB
C++
101 lines
3.1 KiB
C++
/*
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* Copyright (c) 2013-2015, Roland Bock
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* Copyright (c) 2017, Juan Dent
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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 SQLPP11_TRIM_H
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#define SQLPP11_TRIM_H
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#include <sqlpp11/char_sequence.h>
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#include <sqlpp11/data_types/integral/data_type.h>
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#include <sqlpp11/data_types/text/data_type.h>
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namespace sqlpp
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{
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struct trim_alias_t
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{
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struct _alias_t
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{
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static constexpr const char _literal[] = "trim_";
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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 trim;
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T& operator()()
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{
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return trim;
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}
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const T& operator()() const
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{
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return trim;
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}
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};
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};
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};
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template <typename Flag, typename Expr>
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struct trim_t : public expression_operators<trim_t<Flag, Expr>, text>, public alias_operators<trim_t<Flag, Expr>>
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{
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using _traits = make_traits<text, tag::is_expression, tag::is_selectable>;
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using _nodes = detail::type_vector<Expr>;
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using _can_be_null = can_be_null_t<Expr>;
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using _auto_alias_t = trim_alias_t;
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trim_t(const Expr expr) : _expr(expr)
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{
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}
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trim_t(const trim_t&) = default;
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trim_t(trim_t&&) = default;
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trim_t& operator=(const trim_t&) = default;
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trim_t& operator=(trim_t&&) = default;
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~trim_t() = default;
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Expr _expr;
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};
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template <typename Context, typename Flag, typename Expr>
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Context& serialize(const trim_t<Flag, Expr>& t, Context& context)
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{
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context << "TRIM(";
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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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template <typename T>
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auto trim(T t) -> trim_t<noop, wrap_operand_t<T>>
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{
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static_assert(is_expression_t<wrap_operand_t<T>>::value, "trim() requires an expression as argument");
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return {t};
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}
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} // namespace sqlpp
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#endif
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