#ifndef __EXCEPTION_H__#define __EXCEPTION_H__#include <exception>#include <string>class Exception : public std::exception{    public:        Exception(const char *);        Exception(const std::string &);        virtual ~Exception() throw();//表示这个函数不抛出异常        virtual const char * what() const throw();        const char* stackTrace()throw();    private:        void fillStackTrace();//        std::string message_; //异常的名字        std::string stack_; //栈痕迹};#endif

#include "exception.h"#include <execinfo.h>#include <stdlib.h>Exception::Exception(const char *s)    :message_(s){    fillStackTrace();}Exception::Exception(const std::string &s)    :message_(s){    fillStackTrace();}Exception::~Exception() throw(){}const char * Exception::what() const throw(){    return message_.c_str();}void Exception::fillStackTrace(){    const int len = 200;    void * buffer[len];    // 获取栈痕迹 存储在buffer数组中，这里len是数组的最大长度，而返回值nptrs是数组的实际长度    int nptrs = ::backtrace(buffer, len);    //把buffer中的地址转化成字符串存储在strings中    //这里在生成strings的时候调用了malloc函数 动态分配了内存 因此后面需要free    char** strings = ::backtrace_symbols(buffer, nptrs);    if(strings){        int i;        for(i = 0; i < nptrs; i++){            stack_.append(strings[i]);            stack_.push_back(‘\n‘);        }    }    free(strings);}const char *Exception::stackTrace() throw(){    return stack_.c_str();}

#include "exception.h"#include <iostream>using namespace std;void foo(){    throw Exception("foobar");}void bar(){    foo();}int main(int argc, const char *argv[]){    try{        bar();    }    catch(Exception &e){        cout << "reason: " << e.what() << endl;        cout << "stack trace: " << e.stackTrace() << endl;    }    return 0;}