The !! operator reassures the lint tool that what you wrote is what you meant: do this operation, then take the truth value of the result. A third use is to produce logical XOR and logical XNOR.

The ~ operator in C++ (and other C-like languages like C and Java) performs a bitwise NOT operation - all the 1 bits in the operand are set to 0 and all the 0 bits in the operand are set to …

Jun 7, 2011 · What is the ?: (question mark and colon operator aka. conditional or "ternary") operator and how can I use it?

The Operators >> is the arithmetic (or signed) right shift operator. >>> is the logical (or unsigned) right shift operator. << is the left shift operator, and meets the needs of both logical and …

The arrow operator is like dot, except it dereferences a pointer first. foo.bar() calls method bar() on object foo, foo->bar calls method bar on the object pointed to by pointer foo.

Class& operator @= (const Class& rhs); That is, the function takes its parameter by const reference (because it doesn't modify it), then returns a mutable reference to the object.

In general I think the base class should define a operator== overload (internally or via friend class doesn't matter) which check typeid equality and calls an abstract virtual "equals" function …

Jan 13, 2013 · I wonder if adding something like pipe equal operator to this question or any other documentation on the topic wouldn't help people searching.

Nov 25, 2008 · A disadvantage of overloading this operator is that some IDEs become less effective tools as a result. In Visual Studio, you can usually right-click on a method call to go to …

When declare friend operator override in a class, it seems like we cannot implement with Matrix::operator<< (ostream& os, const Matrix& m). Instead we need to just use global …