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87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
/*
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* Copyright (c) 2013, 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_LIMIT_H
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#define SQLPP_LIMIT_H
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#include <ostream>
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#include <sqlpp11/select_fwd.h>
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#include <sqlpp11/type_traits.h>
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namespace sqlpp
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{
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template<typename Limit>
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struct limit_t
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{
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using _is_limit = std::true_type;
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static_assert(is_integral_t<Limit>::value, "limit requires an integral value or integral parameter");
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Limit _limit;
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};
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template<typename Context, typename Limit>
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struct interpreter_t<Context, limit_t<Limit>>
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{
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using T = limit_t<Limit>;
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static Context& _(const T& t, Context& context)
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{
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context << " LIMIT ";
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interpret(t._limit, context);
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return context;
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}
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};
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struct dynamic_limit_t
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{
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using _is_limit = std::true_type;
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using _is_dynamic = std::true_type;
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void set(std::size_t limit)
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{
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_limit = limit;
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}
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std::size_t _limit;
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};
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template<typename Context>
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struct interpreter_t<Context, dynamic_limit_t>
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{
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using T = dynamic_limit_t;
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static Context& _(const T& t, Context& context)
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{
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if (t._limit > 0)
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context << " LIMIT " << t._limit;
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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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