178 lines
4.5 KiB
C++
178 lines
4.5 KiB
C++
/*
|
|
* Copyright (c) 2010-2014 OTClient <https://github.com/edubart/otclient>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#ifndef STDEXT_CAST_H
|
|
#define STDEXT_CAST_H
|
|
|
|
#include "exception.h"
|
|
#include "demangle.h"
|
|
|
|
#include <sstream>
|
|
#include <iostream>
|
|
#include <cstdlib>
|
|
|
|
namespace stdext {
|
|
|
|
// cast a type to another type
|
|
template<typename T, typename R>
|
|
bool cast(const T& in, R& out) {
|
|
std::stringstream ss;
|
|
ss << in;
|
|
ss >> out;
|
|
return !!ss && ss.eof();
|
|
}
|
|
|
|
// cast a type to string
|
|
template<typename T>
|
|
bool cast(const T& in, std::string& out) {
|
|
std::stringstream ss;
|
|
ss << in;
|
|
out = ss.str();
|
|
return true;
|
|
}
|
|
|
|
// cast string to string
|
|
template<>
|
|
inline bool cast(const std::string& in, std::string& out) {
|
|
out = in;
|
|
return true;
|
|
}
|
|
|
|
// special cast from string to boolean
|
|
template<>
|
|
inline bool cast(const std::string& in, bool& b) {
|
|
if(in == "true")
|
|
b = true;
|
|
else if(in == "false")
|
|
b = false;
|
|
else
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
// special cast from string to char
|
|
template<>
|
|
inline bool cast(const std::string& in, char& c) {
|
|
if(in.length() != 1)
|
|
return false;
|
|
c = in[0];
|
|
return true;
|
|
}
|
|
|
|
// special cast from string to long
|
|
template<>
|
|
inline bool cast(const std::string& in, long& l) {
|
|
if(in.find_first_not_of("-0123456789") != std::string::npos)
|
|
return false;
|
|
std::size_t t = in.find_last_of('-');
|
|
if(t != std::string::npos && t != 0)
|
|
return false;
|
|
l = atol(in.c_str());
|
|
return true;
|
|
}
|
|
|
|
// special cast from string to int
|
|
template<>
|
|
inline bool cast(const std::string& in, int& i) {
|
|
long l;
|
|
if(cast(in, l)) {
|
|
i=l;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// special cast from string to double
|
|
template<>
|
|
inline bool cast(const std::string& in, double& d) {
|
|
if(in.find_first_not_of("-0123456789.") != std::string::npos)
|
|
return false;
|
|
std::size_t t = in.find_last_of('-');
|
|
if(t != std::string::npos && t != 0)
|
|
return false;
|
|
t = in.find_first_of('.');
|
|
if(t != std::string::npos && (t == 0 || t == in.length()-1 || in.find_first_of('.', t+1) != std::string::npos))
|
|
return false;
|
|
d = atof(in.c_str());
|
|
return true;
|
|
}
|
|
|
|
// special cast from string to float
|
|
template<>
|
|
inline bool cast(const std::string& in, float& f) {
|
|
double d;
|
|
if(cast(in, d)) {
|
|
f=(float)d;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// special cast from boolean to string
|
|
template<>
|
|
inline bool cast(const bool& in, std::string& out) {
|
|
out = (in ? "true" : "false");
|
|
return true;
|
|
}
|
|
|
|
// used by safe_cast
|
|
class cast_exception : public exception {
|
|
public:
|
|
virtual ~cast_exception() throw() { }
|
|
template<class T, class R>
|
|
void update_what() {
|
|
std::stringstream ss;
|
|
ss << "failed to cast value of type '" << demangle_type<T>() << "' to type '" << demangle_type<R>() << "'";
|
|
m_what = ss.str();
|
|
}
|
|
virtual const char* what() const throw() { return m_what.c_str(); }
|
|
private:
|
|
std::string m_what;
|
|
};
|
|
|
|
// cast a type to another type, any error throws a cast_exception
|
|
template<typename R, typename T>
|
|
R safe_cast(const T& t) {
|
|
R r;
|
|
if(!cast(t, r)) {
|
|
cast_exception e;
|
|
e.update_what<T,R>();
|
|
throw e;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
// cast a type to another type, cast errors are ignored
|
|
template<typename R, typename T>
|
|
R unsafe_cast(const T& t, R def = R()) {
|
|
try {
|
|
return safe_cast<R,T>(t);
|
|
} catch(cast_exception& e) {
|
|
std::cerr << "CAST ERROR: " << e.what() << std::endl;
|
|
return def;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|