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122 lines
3.3 KiB
122 lines
3.3 KiB
/*
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* Copyright (c) 2010-2012 OTClient <https://github.com/edubart/otclient>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef STDEXT_CAST_H
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#define STDEXT_CAST_H
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#include "string.h"
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#include "exception.h"
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#include "demangle.h"
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namespace stdext {
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// cast a type to another type
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template<typename T, typename R>
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bool cast(const T& in, R& out) {
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std::stringstream ss;
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ss << in;
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ss >> out;
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return !!ss && ss.eof();
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}
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// cast a type to string
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template<typename T>
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bool cast(const T& in, std::string& out) {
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std::stringstream ss;
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ss << in;
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out = ss.str();
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return true;
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}
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// cast string to string
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template<>
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inline bool cast(const std::string& in, std::string& out) {
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out = in;
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return true;
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}
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// special cast from string to boolean
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template<>
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inline bool cast(const std::string& in, bool& b) {
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static std::string validNames[2][4] = {{"true","yes","on","1"}, {"false","no","off","0"}};
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bool ret = false;
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for(int i=0;i<4;++i) {
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if(in == validNames[0][i]) {
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b = true;
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ret = true;
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break;
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} else if(in == validNames[1][i]) {
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b = false;
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ret = true;
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break;
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}
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}
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return ret;
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}
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// special cast from boolean to string
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template<>
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inline bool cast(const bool& in, std::string& out) {
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out = (in ? "true" : "false");
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return true;
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}
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// used by safe_cast
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class cast_exception : public exception {
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public:
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virtual ~cast_exception() throw() { }
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template<class T, class R>
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void update_what() {
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m_what = format("failed to cast value of type '%s' to type '%s'", demangle_type<T>(), demangle_type<R>());
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}
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virtual const char* what() { return m_what.c_str(); }
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private:
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std::string m_what;
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};
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// cast a type to another type, any error throws a cast_exception
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template<typename R, typename T>
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R safe_cast(const T& t) {
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R r;
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if(!cast(t, r)) {
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cast_exception e;
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e.update_what<T,R>();
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throw e;
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}
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return r;
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}
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// cast a type to another type, cast errors are ignored
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template<typename R, typename T>
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R unsafe_cast(const T& t, R def = R()) {
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try {
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return safe_cast<R,T>(t);
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} catch(cast_exception& e) {
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std::cout << "CAST ERROR: " << e.what() << std::endl;
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return def;
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}
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}
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}
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#endif
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