Avoiding null pointer exceptions in a large c++ code base -

-

I inherited a large C ++ code base and I have the task of avoiding any null pointer exception The code can be in the base. Are the static analysis tools available, I'm thinking that you have successfully used

what other things can you see?

You can start by terminating the source of zero: 

  if (error) {return tap; }

In 

  if (error) {returnOffice; // Ex: An empty vector}

If the default objects return and your code base already uses an exception, then 

  if (Error) {BadThingHappenedException; }

Then, add handling to the appropriate places.

If you are working with a legacy code, you can create some cover functions / classes: 

  result type * new_function () {ResultType * result = Legacy_function (); If (result) {return result; } And {BadtingHappedExation;

The new functionality should start using new functions and should be handled with the appropriate exception handling.

I know that some programmers do not get exceptions, smart people like, but what is happening with no return is that the tap passes like crazy because everyone thinks That it is not their business and it is not quietly to return. Some functions can return the error code, which is fine, but the caller often ends up responding to errors, until each other returns to Null. Then, you see lots of tap-checking in each single function, no matter how trivial the function is. And, this is the only place that does not check the tap to crash the program. The exception forces you to think carefully about the mistake and decides how and how it should be handled.

It looks like you're just looking at the static solution like the static analysis tool (which you should always use). Changing the signal in the context is also a great solution. However, there is the beauty of Rai in C ++, which eliminates the need to "try {} end {}" everywhere, so I think it's worth your serious thinking.


Comments

Post a Comment

Popular posts from this blog

c# - ListView onScroll event -

-
I am programming a simple C # application, and I need a Scallow event on the list view. So I inherited the original ListView class created in ListviewEx witch. I found out how to locate the scroll message from WinAPI and I modified the WndProc method. Now I have this WndProc: protected override zero WndProc (Ref message message) {base.WndProc (Ref I); If (m.msg == WM_VSCROLL) {onScroll (This, New EventArgs ()); }} But the problem is, I do not know how to know about scrolling information. This data should be in wParam, but there is a LOWORD macro ++ like in C in C # and I switch to find the criteria like SB_ below, SB_ENDSCROLL, SB_PAGEUP etc. there any way Need to change the LOWORD macro from C #? Or any other way to find the necessary parameters about scrolling? You can define the WParam constants as the following: Private const int WM_HSCROLL = 0x114; Private Constant WM_VSCROLL = 0x115; Private contact int SBHOZZ = 0; Private Consultant SB_VERT = 1; Private Con...
Read more

PHP - get image from byte array -

-
I am trying to create a back-end for my mobile application. I am sending the content of an image in the body of the HTTP request (output stream) as a byte array, I want to read this stream of bytes in PHP scripts and take back an image. Can anyone tell me how can I do this? Thank you. You can obtain the request body $ body = Reading from file_get_contents ('php: // input'); What you do with that data Depending on you, you can write the data in a file as you mentioned that this is image data, you can drop the data into the object can do. Another option is to use and load the image.
Read more

Linux Terminal Problem with Non-Canonical Terminal I/O app -

-
I have a small app written in C to run on Linux. Part of the app accepts user-input from keyboard , And it uses non-canonical terminal mode so that it can respond to each keystroke. The section of the code that accepts input is a simple task that is called repeatedly in the loop: char get_input () {char C = 0; Int res = reading (input_tamille, & amp; c, 1); If (RSS == 0) 0 returns; If (res == -1) {/ * snip error handling * /} return c; } It reads a letter from the terminal if there is no input within a given time limit, (c_cc [VTIME] value in the vocabulary structure), read () 0 And get_input () is called again It all works very well, I have recently discovered that if you run this app in a terminal window, and then the app Close the terminal window without ending, the app will not exit Received, but CPU intensive launches into an infinite loop, where the read () returns 0 without waiting continued. So how can I get out of the apple if it runs from the terminal win...
Read more