73d9d3fd64
The Functions class wants to store functions in a map and hand them out later, so we need a shared_ptr. (could have had a map of name -> function factory, maybe one day)
82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Modified by Cloudius Systems
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*
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* Copyright 2014 Cloudius Systems
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*/
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#ifndef CQL3_FUNCTIONS_NATIVE_SCALAR_FUNCTION_HH_
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#define CQL3_FUNCTIONS_NATIVE_SCALAR_FUNCTION_HH_
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#include "native_function.hh"
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#include "scalar_function.hh"
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#include "core/shared_ptr.hh"
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namespace cql3 {
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namespace functions {
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/**
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* Base class for the <code>ScalarFunction</code> native classes.
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*/
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class native_scalar_function : public native_function, public scalar_function {
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protected:
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native_scalar_function(sstring name, shared_ptr<abstract_type> return_type, std::vector<shared_ptr<abstract_type>> args_type)
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: native_function(std::move(name), std::move(return_type), std::move(args_type)) {
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}
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public:
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virtual bool is_aggregate() override {
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return false;
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}
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};
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template <typename Func, bool Pure>
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class native_scalar_function_for : public native_scalar_function {
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Func _func;
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public:
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native_scalar_function_for(sstring name,
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data_type return_type,
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const std::vector<data_type> arg_types,
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Func&& func)
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: native_scalar_function(std::move(name), std::move(return_type), std::move(arg_types))
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, _func(std::forward<Func>(func)) {
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}
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virtual bytes execute(int protocol_version, const std::vector<bytes>& parameters) override {
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return _func(protocol_version, parameters);
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}
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};
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template <bool Pure, typename Func>
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shared_ptr<function>
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make_native_scalar_function(sstring name,
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data_type return_type,
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std::vector<data_type> args_type,
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Func&& func) {
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return ::make_shared<native_scalar_function_for<Func, Pure>>(std::move(name),
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std::move(return_type),
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std::move(args_type),
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std::forward<Func>(func));
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}
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}
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}
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#endif /* CQL3_FUNCTIONS_NATIVE_SCALAR_FUNCTION_HH_ */
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