Initializing vector with {}, expected a ";". List Initialization C++11.

[Olysold]

Feel like I'm missing something painfully glaring, but I copied the code right off the book.

#include <iostream>
#include <vector>
using std::cin;
using std::cout; using std::endl;
using std::vector;

int main()
{
	vector<int> v{1,2,3,4,5,6,7,8,9};

	for (auto &i : v)
		i *= i;

	for (auto i : v)
		cout << i << " ";
	cout << endl;

}

//Error appears right after v.
vector<int> v{1,2,3,4,5,6,7,8,9};

What am I missing? =/

[thejman250]

- I'm not sure that you can even initialize vectors as such.

- However, if you can, you would probably need an "=" sign between "v" and the first "{" on line 9.

[Olysold]

Adding the "=" in between does state that initialization with '{...}' isn't allowed for object of type "std::vector<int, std::allocator<int>>".

Looking back in the book (C++ Primer 5th ed.), I think this kind of initialization is introduce in C++11. They call it "List Initializing".

I'm using VS Express 2012, isn't C++11 in that?

[thejman250]

- If you cant initialize vectors, then use the push_back function of the vector template.

[Olysold]

Thanks for the advice. The problem is with the compiler. Updating VS to include additional C++11 features (one of which is List Initialization) didn't seem to work for me.

http://www.microsoft.com/en-us/download/details.aspx?id=35515 Link to the update.

There are other compiler alternatives but I guess this isn't a big deal right now. Just throwing this out there in case someone else is in the same wondering position as I am.

[Chervil]

I don't use that particular compiler. However, it may be necessary to specify certain compiler options in order to enable / disable specific features.

[Disch]

I don't think this is supported in MSVS yet. VS2012 only has partial C++11 support.

[Olysold]

If I understand this list correctly:

http://wiki.apache.org/stdcxx/C++0xCompilerSupport

Initializer lists was added in 11.0 nov'12. Even the update page explicitly mentions this feature. I changed my project's Platform Toolset to the nov'12 update (following the instructions on the download page), but still doesn't seem to work.

Then again I'm still a scrub on all of this, so I'm not sure what other options are there to enable. Yeah Disch noticed that from the Apache list.

Code::blocks works though. I suppose GCC and Clang are the better compilers? (Pardon me if that isn't their right terminology)

[cire]

Initializer lists were included in the Nov 12 CTP, however the library code wasn't modified to use them. I don't expect the std library will be until it's added as a non-preview type of feature.