异常的封装

这里展示的是自定义异常类，继承与exception类。

#include <stdexcept>

namespace youren {
////////////////////////////////////////////////
class YR_Exception : public exception
{
public:
	YR_Exception(const string& buffer);
	YR_Exception(const string& buffer, int err);
	~YR_Exception() throw();
	
	//错误信息
	virtual const char* what() const throw();
	//获取错误码
	int getErrCode(){ return _code;}
private:
	void getBacktrace();
private:
	string _buffer;
	int _code;
};
}

其实现如下：

#include "util/YR_Exception.h"
#include <execinfo.h>
#include <string.h>
#include <stdlib.h>
#include <cerrno>

namespace youren
{

YR_Exception::YR_Exception(const string &buffer)
:_buffer(buffer), _code(0)
{
}

YR_Exception::YR_Exception(const string &buffer, int err)
{
    _buffer = buffer + " :" + strerror(err);
    _code   = err;
}

YR_Exception::~YR_Exception() throw()
{
}

const char* YR_Exception::what() const throw()
{
    return _buffer.c_str();
}

void YR_Exception::getBacktrace()
{
    void * array[64];
    int nSize = backtrace(array, 64);
    char ** symbols = backtrace_symbols(array, nSize);

    for (int i = 0; i < nSize; i++)
    {
        _buffer += symbols[i];
        _buffer += "\n";
    }
    free(symbols);
}
}