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111 lines
3.5 KiB
C++
111 lines
3.5 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_ALIAS_H
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#define SQLPP_ALIAS_H
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#include <sqlpp11/type_traits.h>
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namespace sqlpp
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{
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namespace alias
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{
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#define SQLPP_ALIAS_PROVIDER_GENERATOR(name) \
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struct name##_t\
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{\
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struct _name_t\
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{\
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static constexpr const char* _get_name() { return #name; }\
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};\
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template<typename T>\
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struct _member_t\
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{\
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template<typename... TT>\
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_member_t(TT&&... t): name(std::forward<TT>(t)...) {}\
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\
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template<typename TT>\
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_member_t& operator=(TT&& t) { name = std::forward<TT>(t); return *this; }\
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\
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T name;\
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};\
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};\
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constexpr name##_t name = {};
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SQLPP_ALIAS_PROVIDER_GENERATOR(a);
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SQLPP_ALIAS_PROVIDER_GENERATOR(b);
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SQLPP_ALIAS_PROVIDER_GENERATOR(c);
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SQLPP_ALIAS_PROVIDER_GENERATOR(d);
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SQLPP_ALIAS_PROVIDER_GENERATOR(e);
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SQLPP_ALIAS_PROVIDER_GENERATOR(f);
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SQLPP_ALIAS_PROVIDER_GENERATOR(g);
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SQLPP_ALIAS_PROVIDER_GENERATOR(h);
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SQLPP_ALIAS_PROVIDER_GENERATOR(i);
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SQLPP_ALIAS_PROVIDER_GENERATOR(j);
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SQLPP_ALIAS_PROVIDER_GENERATOR(k);
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SQLPP_ALIAS_PROVIDER_GENERATOR(l);
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SQLPP_ALIAS_PROVIDER_GENERATOR(m);
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SQLPP_ALIAS_PROVIDER_GENERATOR(n);
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SQLPP_ALIAS_PROVIDER_GENERATOR(o);
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SQLPP_ALIAS_PROVIDER_GENERATOR(p);
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SQLPP_ALIAS_PROVIDER_GENERATOR(q);
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SQLPP_ALIAS_PROVIDER_GENERATOR(s);
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SQLPP_ALIAS_PROVIDER_GENERATOR(t);
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SQLPP_ALIAS_PROVIDER_GENERATOR(u);
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SQLPP_ALIAS_PROVIDER_GENERATOR(v);
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SQLPP_ALIAS_PROVIDER_GENERATOR(w);
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SQLPP_ALIAS_PROVIDER_GENERATOR(x);
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SQLPP_ALIAS_PROVIDER_GENERATOR(y);
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SQLPP_ALIAS_PROVIDER_GENERATOR(z);
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SQLPP_ALIAS_PROVIDER_GENERATOR(left);
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SQLPP_ALIAS_PROVIDER_GENERATOR(right);
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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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struct _value_type: Expression::_value_type
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{
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using _is_expression = tag_no;
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using _is_named_expression = tag_yes;
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using _is_alias = tag_yes;
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};
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using _name_t = typename AliasProvider::_name_t;
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template<typename T>
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using _member_t = typename AliasProvider::template _member_t<T>;
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template<typename Db>
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void serialize(std::ostream& os, Db& db) const
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{
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os << "("; _expression.serialize(os, db); os << ") AS " << _name_t::_get_name();
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}
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Expression _expression;
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};
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}
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#endif
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