Is it ok to assume 0 is false and 1 is true?

[anarelle]

I've seen code where a condition is evaluated based on an int variable instead of bool.

int condition
cin >> condition;
if (!condition)
    //do something 

I know that C++ supports that 0 is false and 1 is true, but is this safe code? Is it supported by all C++ compilers as a standard?

Could it also be a bad practice considering that you might switch to another language and find out that this kind of code isn't supported?

[coder777]

but is this safe code?

Yes.

Is it supported by all C++ compilers as a standard?

Yes.

The point is that 0 is false and all other numbers (negative as well as positive) are true.

Could it also be a bad practice considering that you might switch to another language and find out that this kind of code isn't supported?

If you switch to another language you will find that much more is not supported. But who knows, it depends on the other language.

[JLBorges]

> Is it supported by all C++ compilers as a standard?

Yes.

In a boolean context, zero is false, non-zero is true;
null pointer or pointer to member is false, non-null pointer or pointer to member is true.

In an integer context, true is 1, false is 0.