从静态constexpr初始化向量时，C ++未知类型

Question

C++ gcc compiler gives unclear error when compile:

    #include <iostream>
#include <vector>
using namespace std;

class A
{
  constexpr static int i = 10;
  vector<int>m(i);
};

int main()
{
  return 0;
}

I compile with: g++ var_test.cc -o var_test -std=c++0x Result:

var_test.cc:8:16: error: unknown type name 'i'
vector<int>m(i);

Why is it unknown? C++0x should have in place member initialization

Answer 1

C++11 does support in-place non-static member initialization, but to use it you need a brace-or-equal-initializer , ie one of these forms:

vector<int> m {i};
vector<int> m = vector<int>(i);
vector<int> m = vector<int>{i};

Using parentheses isn't supported as it looks too much like a function declaration.