sachinc.biradar@gmail.com writes:
Quote:
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Why can't we pass an argument to constructor as pointer?
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Because this would allow passing NULL to copy constructor and what does
it mean to copy object which does not exist?
Quote:
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As per my knowledge referance is like const pointer.
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On implementation level probably yes, however:
1. const pointer can have NULL value (ie. point to nowhere), reference
always references some object;
2. you can use pointer arithmetic with const pointer but you cannot do it
with reference; and
3. you cannot have reference to void type.
For instance:
#v+
void funcPtr(char *const ptr) {
std::cout << *ptr << '\n'; /* may produce undefined behaviour because
ptr may be NULL. */
for (int i = 0; i < 10; ++i) {
std::cout << ptr[i] << '\n'; /* you can treat ptr as array. */
}
}
void funcRef(char &ref) {
std::cout << ref << '\n'; /* this won't be UB. */
for (int i = 0; i < 10; ++i) {
std::cout << ref[i] << '\n'; /* error: you cannot do such a thing */
}
}
#v-
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Copy Constructor Query 
