Web Reference: Jul 23, 2025 · When we create our own copy constructor, we pass an object by reference and we generally pass it as a const reference. One reason for passing const reference is, we should use const in C++ wherever possible so that objects are not accidentally modified. Apr 21, 2010 · If the argument is passed by value, its copy constructor would call itself to copy the actual parameter to formal parameter. This process would go on until the system runs out of memory. •Assignment: When one object's value is assigned to another object, the first object is copied to the second object. So, this code copies the value of b into a:
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