Saturday, August 1, 2009

default assignment in 5 kinds of c++ variables

-- ptr assignment, primitive or class type
float* newPtr = oldPtr; // copies address of the wrapped object. This is what happens in a default copier and assignment

-- primitive ref assignment
overwrite object State, just like java primitive assignment.

Note if a class has a ref field and a ptr field, they behave differently during the field-by-field class assignment!

-- class type ref assignment
MyClass& newRef = someRef;
newRef = oldRef; // overwrites object state, field by field

-- primitive nonref assignment
obvious

-- class type nonref variable
MyClass v; // ctor
v = v2; // field by field state overwrite by assignment operator

------various types of variables to look at
) Primitives ^ class types
) Pointer(and ref) ^ nonref types

A very detailed stroke-by-stroke on assignment overload -- http://icu-project.org/docs/papers/cpp_report/the_anatomy_of_the_assignment_operator.html

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