constructor call

[Peter87]

You can buy the standard here: http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=50372

Most of us just use the latest free draft that is almost the same as the real standard http://www.open-std.org/Jtc1/sc22/wg21/docs/papers/2011/n3242.pdf
There was a free draft that was identical to the real standard but they removed it. You can probably find that draft or the real standard if you search for it.

[zb0S216C]

hooshdar3 wrote:

"+I got the idea from reading Herbet Shieldt's text that copy constructor is optional.true?"

His books normally contain bad practices; be wary. As for the copy-constructor begin optional, the compiler has the last say, because the compiler will implicitly create its own copy-constructor only if its use is required. For instance:

This code will generate a copy-constructor:

struct Object
{
    int a_;
};

int main()
{
    Object a_, b_(a_); 
}

Since b_ depends on the state of a_, the compiler will generate a copy-constructor for b_ but not a_, because a_ didn't require the use of the copy-constructor.

Scott Meyers wrote:

"NamedObject declares neither copy constructor nor copy assignment operator, so compilers will generate those functions (if they are needed). "

_Wazzak

[hooshdar3]

Framework (2534) Jun 27, 2012 at 3:29pm
hooshdar3 wrote:
"+I got the idea from reading Herbet Shieldt's text that copy constructor is optional.true?"

His books normally contain bad practices; be wary. As for the copy-constructor begin optional, the compiler has the last say, because the compiler will implicitly create its own copy-constructor only if its use is required. For instance:

This code will generate a copy-constructor:

1
2
3
4
5
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7
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9



struct Object
{
int a_;
};

int main()
{
Object a_, b_(a_);
}


Since b_ depends on the state of a_, the compiler will generate a copy-constructor for b_ but not a_, because a_ didn't require the use of the copy-constructor.

Scott Meyers wrote:
"NamedObject declares neither copy constructor nor copy assignment operator, so compilers will generate those functions (if they are needed). "


Wazzak

What about my example code?the constructors are called 6 times?What about copy- or defaault-ctor each?