c++中的Exceptions异常处理(翁恺c++公开课[36])

Exceptions用于处理Run-time Error；

//文件读取的异常捕获伪代码
try{
    open the file;
    determine its size;
    allocate that much memory;
    read the file into memory;
    close the file;
}catch(fileOpenFailed){
    doSomething;
}catch(sizeDeterMinationFailed){
    doSomething;
}catch(memoryAllocationFailed){
    doSomething;
}catch(readFailed){
    doSomething;
}catch(fileCloseFailed){
    doSomething;   
}

 异常，让函数发现有自己无法处理的错误时抛出一个异常