d50139351f
There's no benefit to using C include guards so switch to pragma once everywhere for consistency. Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
80 lines
2.4 KiB
C++
80 lines
2.4 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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#pragma once
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#include "function_name.hh"
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#include "types.hh"
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#include <vector>
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#include <experimental/optional>
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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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using opt_bytes = std::experimental::optional<bytes>;
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virtual ~function() {}
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virtual const function_name& name() const = 0;
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virtual const std::vector<data_type>& arg_types() const = 0;
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virtual data_type return_type() const = 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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virtual void print(std::ostream& os) const = 0;
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virtual bool uses_function(const sstring& ks_name, const sstring& function_name) = 0;
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virtual bool has_reference_to(function& f) = 0;
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friend class function_call;
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friend std::ostream& operator<<(std::ostream& os, const function& f);
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};
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inline
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std::ostream&
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operator<<(std::ostream& os, const function& f) {
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f.print(os);
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return os;
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}
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}
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}
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