如何初始化没有默认成员的对象的成员数组？ [英] How can I initialise a member array of objects that don't have a default constuctor?

问题描述

我想知道是否有人可以告诉我应该如何初始化对象的成员数组，在对象没有默认构造函数（即需要参数）的情况下。

I was wondering if anyone could tell me how I'm supposed to initialise a member array of objects, in the occasion that the object does not have a default constructor (i.e. requires parameters).

例如：

class Foo
{
public:
   Foo() : 
      memberArray{bar(1), bar(3), bar(2)}   // **The compiler doesnt like this** 
   {}
private:
   Bar memberArray[3];
};


struct Bar
{
   Bar(std::int32_t param1) {  }
}

我使用GCC 4.6.1和编译c ++ 11。任何人都可以指出我在哪里错了？ （BTW，请不要建议动态分配的内存，因为我没有它。）

I'm using GCC 4.6.1, and compiling for c++11. Can anyone point out where I'm going wrong? (BTW. please don't suggest dynamically allocated memory, as I don't have it..)

推荐答案

有几个问题：不一致的情况下，声明前使用，缺少分号，缺少包含。这是非常接近的：

You've got several problems: inconsistent case, use before declaration, missing semicolons, missing includes. This is a lot closer:

struct Bar
{
   Bar(int param1) {  }
};

class Foo
{
public:
   Foo() : 
      memberArray{Bar(1), Bar(3), Bar(2)}
   {}
private:
   Bar memberArray[3];
};

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