mirror of
https://github.com/rbock/sqlpp11.git
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142 lines
3.8 KiB
C++
142 lines
3.8 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_OFFSET_H
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#define SQLPP_OFFSET_H
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/vendor/policy_update.h>
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namespace sqlpp
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{
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namespace vendor
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{
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// OFFSET
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template<typename Offset>
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struct offset_t
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{
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using _is_offset = std::true_type;
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static_assert(is_integral_t<Offset>::value, "offset requires an integral value or integral parameter");
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offset_t(Offset value):
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_value(value)
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{}
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offset_t(const offset_t&) = default;
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offset_t(offset_t&&) = default;
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offset_t& operator=(const offset_t&) = default;
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offset_t& operator=(offset_t&&) = default;
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~offset_t() = default;
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Offset _value;
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};
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template<typename Database>
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struct dynamic_offset_t
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{
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using _is_offset = std::true_type;
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using _is_dynamic = std::true_type;
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dynamic_offset_t():
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_value(noop())
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{
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}
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template<typename Offset>
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dynamic_offset_t(Offset value):
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_initialized(true),
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_value(typename wrap_operand<Offset>::type(value))
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{
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}
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dynamic_offset_t(const dynamic_offset_t&) = default;
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dynamic_offset_t(dynamic_offset_t&&) = default;
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dynamic_offset_t& operator=(const dynamic_offset_t&) = default;
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dynamic_offset_t& operator=(dynamic_offset_t&&) = default;
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~dynamic_offset_t() = default;
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template<typename Offset>
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void set_offset(Offset value)
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{
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using arg_t = typename wrap_operand<Offset>::type;
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_value = arg_t(value);
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_initialized = true;
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}
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bool _initialized = false;
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interpretable_t<Database> _value;
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};
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struct no_offset_t
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{
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using _is_noop = std::true_type;
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};
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// Interpreters
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template<typename Context, typename Offset>
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struct interpreter_t<Context, offset_t<Offset>>
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{
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using T = offset_t<Offset>;
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static Context& _(const T& t, Context& context)
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{
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context << " OFFSET ";
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interpret(t._value, context);
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return context;
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}
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};
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template<typename Context, typename Database>
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struct interpreter_t<Context, dynamic_offset_t<Database>>
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{
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using T = dynamic_offset_t<Database>;
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static Context& _(const T& t, Context& context)
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{
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if (t._initialized)
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{
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context << " OFFSET ";
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interpret(t._value, context);
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}
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return context;
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}
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};
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template<typename Context>
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struct interpreter_t<Context, no_offset_t>
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{
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using T = no_offset_t;
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static Context& _(const T& t, Context& context)
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{
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return context;
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}
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};
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}
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}
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#endif
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