C ++-在C ++类中初始化私有数组

Question

I'm having a problem of storing data into the private array in a class.

I tried to Google and didn't find any solution.

Here's my code:

Foo.h

class Foo {
private:
    int arr[10];
    double d;
public:
    Foo::Foo(double d) {
        this->d = d;
    }
    // ...
};

Foo.cpp

int main() {
    double d = 123.456;
    int array[10];
    // Getting data from user input by for-loop 10 times.

    Foo f = Foo(d);

And here's my problem -- how to save the array into the f ?

Seems like using pointer ( *f.arr = array; ) doesn't acturally change the arr .

---

I tried this solution by adding

class Foo {
// ...
Public:
    Foo::Foo(int arr_, double d_) : arr_(new int[10]), d_(d) { };

But the Visual Studio 2017 says the array is not initialized.

---

I also tried this solution , but VS says cannot modify the array in this scope.

Please help. Thank you in advance.

Answer 1

#include <algorithm>  // std::copy()
#include <iterator>   // std::size()

class Foo {
private:
    int arr[10];
    double d;
public:
    Foo(double d, int *data)
    : d{ d }
    {
        std::copy(data, data + std::size(arr), arr);
    }
    // ...
};