结构内缺少初始值设定项的警告[关闭]

我有以下C++代码:

#include <iostream>
#include <stdint.h>
class X {
  private:
   struct {
    uint32_t a;
    uint32_t b;
   } myStruct{};
};

int main() {
  X x;
}

当我想用gcc 4.8.2编译它时,我有以下错误:

$ g++ -std=c++11 -Wall -Wextra -Wshadow -Wunused -Wunused-value -Wunused-variable -Wunused-parameter -Wunused-label -Wunused-function sample.cpp -o out

warning: missing initializer for member 'X::<anonymous struct>::a'
[-Wmissing-field-initializers]
   } myStruct{};
              ^

warning: missing initializer for member 'X::<anonymous struct>::b'
[-Wmissing-field-initializers]
   } myStruct{};
              ^

我想我的编译器会自动设置变量 a 和 b 到0。。。