70 lines
2.1 KiB
C++
70 lines
2.1 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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* Copyright 2014 Cloudius Systems
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*
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* Modified by Cloudius Systems
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*/
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#ifndef CQL3_FUNCTIONS_FUNCTION_HH
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#define CQL3_FUNCTIONS_FUNCTION_HH
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#include "database.hh"
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#include <vector>
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namespace cql3 {
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namespace functions {
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class function {
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public:
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virtual ~function() {}
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virtual function_name name() = 0;
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virtual std::vector<data_type> arg_types() = 0;
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virtual data_type return_type() = 0;
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/**
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* Checks whether the function is a pure function (as in doesn't depend on, nor produce side effects) or not.
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*
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* @return <code>true</code> if the function is a pure function, <code>false</code> otherwise.
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*/
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virtual bool is_pure() = 0;
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/**
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* Checks whether the function is a native/hard coded one or not.
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*
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* @return <code>true</code> if the function is a native/hard coded one, <code>false</code> otherwise.
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*/
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virtual bool is_native() = 0;
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/**
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* Checks whether the function is an aggregate function or not.
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*
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* @return <code>true</code> if the function is an aggregate function, <code>false</code> otherwise.
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*/
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virtual bool is_aggregate() = 0;
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protected:
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virtual bool uses_function(sstring ks_name, sstring function_name) = 0;
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virtual bool has_reference_to(function& f) = 0;
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};
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}
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}
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#endif
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