mirror of
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82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
/* -------------------------------------------------------------------------- */
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/* Copyright 2002-2019, OpenNebula Project, OpenNebula Systems */
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/* */
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/* Licensed under the Apache License, Version 2.0 (the "License"); you may */
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/* not use this file except in compliance with the License. You may obtain */
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/* 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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#ifndef ENUM_STRING_H
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#define ENUM_STRING_H
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#include <map>
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#include <algorithm>
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#include <assert.h>
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#include <typeinfo>
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#include <sstream>
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/**
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* Converts string to enum and back
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*/
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template <typename T>
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class EString
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{
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public:
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/**
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* Constructor
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* @param _em map with string associations
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* @param check_sanity check that all enums have a string representation
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* Works only for continuous enums starting with zero
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* Last enum must be ENUM_MAX
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*/
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EString(const std::map<std::string, T>&& _em, bool check_sanity = true)
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: enum_map(_em)
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{
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if (check_sanity && (int)T::ENUM_MAX != enum_map.size())
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{
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std::ostringstream oss;
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oss << " EString: Not all strings defined for enum "
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<< typeid(T).name();
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throw std::runtime_error(oss.str());
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}
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}
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T _from_str(const std::string& sv) const
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{
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const auto it = enum_map.find(sv);
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if ( it == enum_map.end() )
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{
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return T::UNDEFINED;
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}
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return it->second;
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}
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const std::string& _to_str(T ev) const
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{
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const auto it = std::find_if(enum_map.begin(), enum_map.end(),
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[ev](const std::pair<std::string, T> & t) -> bool
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{
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return t.second == ev;
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});
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return it->first;
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}
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private:
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const std::map<std::string, T> enum_map;
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};
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#endif /*ENUM_STRING_H*/
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