Dnia 20-11-2010 o 17:09:00 spir <denis.s...@gmail.com> napisał(a):
It's busting the whole const system to smithereens.
char[] chars = "abc";
char[] backdoor = chars;
string s = chars;
assert (s == "abc");
backdoor.front = 'k';
assert (s == "abc"); // fails. not so immutable, huh?
???
backdoor and s do not denote the same element. One is a mutable array,
the other is immutable. Why should changing backdoor affect s? Whether
backdoor and chars denote the same array depends on whether "=" copies
or not dyn arrays. But from immutable string to mutable array, there
must be a copy (read: dup).
OK, I get it. I still like it the way it is. Having worked with C++ code
with overloaded assignment ops and implicit conversions, I see = that
sometimes dups and sometimes aliases as a source of confusion and
performance bugs. All this just to remove .idup (it's 5 chars!).
--
Tomek
