Re: implicit copy/move constructors
On 16 Aug., 20:49, Gene Bushuyev <publicfil...@gbresearch.com> wrote:
I've been testing rvalues in gcc 4.5 and VC 2010 and noticed they both
generated implicit copy constructors even though I provided custom
move constructors, which led to some surprises before I found that. Is
that conforming to the latest C++0x? I kind of expected the other ctor
to be suppressed by providing the user defined copy/move ctor.
Its not the fault of the implementations: The rules had been
changed slightly rather recently. According to the most recent
draft a user-declared move-constructor (assignment operator)
prevents an implicitly declared copy-constructor (assignment
operator) and vice versa. Note that an explicitly defaulted
or deleted special member function is also a user-declaration,
e.g.:
struct X {
X(const X&) = default; // No implicitly declared move-
// constructor
X& operator=(const X&) = delete; // No implicitly declared
// move-assignment operator
};
HTH & Greetings from Bremen,
Daniel Kr?gler
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