Easy way find uninitialized member variables

user_254669 0
Viewed 44658

I am looking for an easy way to find uninitialized class member variables.

Finding them in either runtime or compile time is OK.

Currently I have a breakpoint in the class constructor and examine the member variables one by one.

initialization c++
11 Answers

Valgrind (FREE, on Linux) and Purify (on Windows) find un-initialized variables, invalid pointers and such by running your code in a special virtual machine.

This is easy to use and extremely powerful; it will likely find many bugs beyond the obvious un-initialized variables.

Coverity, Klocwork and Lint can find un-initialized variables using static code analysis.

user_157210

Valgrind can tell you if you are on linux.

user_117220

-Wuninitialized ?

(This only checks if a variable is used uninitialized, i.e. if

struct Q { 
  int x, y;
  Q() : x(2) {}
  int get_xy() const { return x*y; }
};

g++ will warn only when the user calls get_xy() without assigning to y.)

user_2246710

If you're using Visual Studio, you could compile in debug mode, stop the program in the debugger and look for which variables are initialised to bytes containing 0xCC (stack) or 0xCD (heap).

Though personally, I'd invest in a static analysis tool for a more thorough approach.

user_249130
user_2381280
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