How do I initialize an array when an object is created?

I'm not sure how to use array variables with objects. How do you initialize an array when an object is created. 开发者_C百科An array that is a data member of an object.

I'm hoping to use an initialization list.

If your compiler supports it, you can do it like this:

struct Foo
{
     int n[5];
     Foo() :n{1,2,3,4,5} {}
};

Soon enough, that will be standard. GCC supports it now, I'm not sure what other compilers do.

An array member variable can only be default-initialized, you cannot provide explicit initialization values.

struct Foo {
  Foo() : bar() {}  // Default-initialize bar, for int this means initialize with 0
  int bar[10];
};

If you want anything else, you'll have to assign in the constructor body.

struct Foo {
  Foo() : bar() {
    bar[3] = 1;
  }  
  int bar[10];
};