C++11的初始化列表的一个问题,编译错误

[msister]

#include<cstdio>
#include<functional>
#include<vector>
#include<memory>
using namespace std;
struct s{
	int i;
	s():i(22){printf("ctor\n");}
	s(const s&ss){i=ss.i;}
	s& operator=(const s&ss){i=ss.i;return *this;}
};
struct a{
	int i;
	int j;
	int k;
};
struct c1{
	int i;
	int j;
	int k;
	c1( std::initializer_list<int> list ){
	}
};
struct c2: c1
	c2( std::initializer_list<int> list )
	    :c1( list ){
	}
};
struct is{
	virtual void f()=0;
}
constexpr int GetFour(){ return 4; }
int main(void){
	vector<s> buf(3);
	for(s x:buf){
		printf("%d\n",x.i);
	}
	const int i=2;
	char pc[i];
	short ps[GetFour()];
	a a1={1,2,3};
	c2 obj{1,2,3};
	return 0;
}

我在mingw9.0+GCC4.7编译:

////////////////////
D:\>g++ my.cpp
my.cpp:24:2: error: expected '{' before 'c2'
my.cpp:23:1: error: new types may not be defined in a return type
my.cpp:23:1: note: (perhaps a semicolon is missing after the definition of '<typ
e error>')
my.cpp: In function 'int c2(std::initializer_list<int>)':
my.cpp:25:7: error: only constructors take member initializers
my.cpp: At global scope:
my.cpp:27:1: error: expected declaration before '}' token

究竟错在哪里?

[zhangsongcui]

24： struct c2: c1 “{”

31： }“;”