数组的 C++ 构造函数初始值设定项

C++ Constructor initializer for arrays

我正在使用 C++11,我想在构造函数的初始化列表中初始化一个对象数组。我找到了一个相关的问题,但它不符合我的需求:

编译:

class foo {
  public:
    foo(int& n) : i(n) {}
    //~foo() {} // If uncommented, it doesn't compile.

  private:
    int& i;

    // Disable copy constructor and assignment operator.
    foo(const foo&) = delete;
    foo& operator=(const foo&) = delete;
};

class bar {
  public:
    bar()
      : f{{i}, {i}}
    {
    }

  private:
    foo f[2];
    int i;
};

不编译:

class foo {
  public:
    foo(int& n) : i(n) {}
    ~foo() {} // If uncommented, it doesn't compile.


  private:
    int& i;

    // Disable copy constructor and assignment operator.
    foo(const foo&) = delete; // If commented out, it compiles.
    foo& operator=(const foo&) = delete;
};

class bar {
  public:
    bar()
      : f{{i}, {i}}
    {
    }

  private:
    foo f[2];
    int i;
};

我正在使用 g++ 并收到以下错误:

main.cpp: In constructor ‘bar::bar()’:
main.cpp:10:5: error: ‘foo::foo(const foo&)’ is private
main.cpp:17:19: error: within this context
main.cpp:17:19: error: use of deleted function ‘foo::foo(const foo&)’
main.cpp:10:5: error: declared here

如果对象是不可复制的,为什么会有所不同?

这是一个已知的 GCC 错误 63707 with status NEW. The same code works fine in CLANG