error.hh

来自「一个mips虚拟机非常好代码,使用C++来编写的,希望大家多学学,」· HH 代码 · 共 67 行

#ifndef error_hh_included
#define error_hh_included

#include "object.hh"


// Centralized error handling using C++ exceptions. I'm imposing a limit of
// 1023 characters on an generic error message, which should hardly be a
// problem. The message is specified using a simplified printf() syntax, (see:
// sulima/echo.cc), as I had the code handy, and it easily allows 64 bit
// arguments.

class Error
    : public Object
{
protected:
    // The message data.
    char msg[1024];
    // Handle any cascaded errors (exceptions thrown in what())
    static const char *cascaded();
    // An empty constructor for derived classes.
    Error() { }
public:
    // A printf-like constructor.
    Error(const char *m, ...);
    // Virtual destructor.
    virtual ~Error();
    // Display the message.
    virtual const char *what() const;
};


// A cut-down `out of memory' error message.

class OutOfMemory
    : public Error
{
public:
    const char *what() const;
};


// A generic error message stored in `errno'.

class SysError
    : public Error
{
protected:
    int ec;
public:
    SysError();
    const char *what() const;
};


// A file-related SysError (the file name is printed before the message.)

class FileError
    : public Error
{
public:
    FileError(const char *n);
};


#endif // error_hh_included