std::unique_ptr: Creating unique_ptr to hold array of pointers to something.

gistfile1.cpp

//	unique_ptr
//	Case 1:	Array of type
//	Case 2:	Array of pointer to type

#include <iostream>
#include <memory>

class Bar {
public:
	Bar(float b) : bb(b) {
		std::cout << "Bar" << std::endl;
	}
	~Bar() {
		std::cout << "~Bar" << std::endl;
	}

	float bb;
};

int main() {
	//Case 1
	std::unique_ptr<int []> foo(new int[10]);
	for (int i = 0; i < 10; ++i) {
		foo[i] = i*i;
	}
	for (int i = 0; i < 10; ++i) {
		std::cout << "foo[" << i << "] = " << foo[i] << std::endl;
	}
	
	//Case 2
	//	Bar** boo = new Bar* [10]
	std::unique_ptr<Bar* [], void(*)(Bar**)> boo(new Bar*[10], [](Bar** boo_ptr){
		for(int i = 0; i < 10; ++i) {
			delete boo_ptr[i];
		}
		delete [] boo_ptr;
	});
	
	for(int i = 0; i < 10; ++i) {
		boo[i] = new Bar(i * 0.5f);
	}
	for(int i = 0; i < 10; ++i) {
		std::cout << "bar[" << i << "] = " << boo[i]->bb << std::endl;
	}
	return 0;
}

//OUTPUT
whackylabs:Projects sidharthjuyal$ clang++ unique_ptr_arr.cpp -o unique_ptr_arr -std=c++11 -stdlib=libc++ && ./unique_ptr_arr
foo[0] = 0
foo[1] = 1
foo[2] = 4
foo[3] = 9
foo[4] = 16
foo[5] = 25
foo[6] = 36
foo[7] = 49
foo[8] = 64
foo[9] = 81
Bar
Bar
Bar
Bar
Bar
Bar
Bar
Bar
Bar
Bar
bar[0] = 0
bar[1] = 0.5
bar[2] = 1
bar[3] = 1.5
bar[4] = 2
bar[5] = 2.5
bar[6] = 3
bar[7] = 3.5
bar[8] = 4
bar[9] = 4.5
~Bar
~Bar
~Bar
~Bar
~Bar
~Bar
~Bar
~Bar
~Bar
~Bar