views:

342

answers:

1

hi i wrote this program in VC++ 2010:

class class1
{
public:
 class1 (initializer_list<int> a){};
 int foo;
 float Bar;
};
void main()
{
 class1 c = {2,3};
 getchar();
}

but i get this errors when i compile project:

Error 1 error C2552: 'c' : non-aggregates cannot be initialized with initializer list c:\users\pswin\documents\visual studio 2010\projects\test_c++0x\test_c++0x\main.cpp 27

and

2 IntelliSense: initialization with '{...}' is not allowed for object of type "class1" c:\users\pswin\documents\visual studio 2010\projects\test_c++0x\test_c++0x\main.cpp 27

what is the problem?

+14  A: 

It shouldn't be supported at all:

[...] the C++0x Core Language feature of initializer lists and the associated Standard Library changes weren't implemented in VC10.

The error message refers to the pre-C++0x feature of aggregate initialization, which allows the initialization of certain user-defined types by using curly braces:

struct pair { int first; char second; };
pair p = { 0, 'c' };

Aggregates are defined in §8.5.1:

An aggregate is an array or a class (clause 9) with no user-declared constructors (12.1), no private or protected non-static data members (clause 11), no base classes (clause 10), and no virtual functions (10.3).

When an aggregate is initialized the initializer can contain an initializer-clause consisting of a brace- enclosed, comma-separated list of initializer-clauses for the members of the aggregate, written in increasing subscript or member order. If the aggregate contains subaggregates, this rule applies recursively to the members of the subaggregate.

Georg Fritzsche