Using std::shuffle with a dynamically allocated vector that holds a custom class.

main.cpp

#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <random>

class widget {
private:
	int feet;
	int inches;
public:
	widget(int feet, int inches)
	{
		this->inches = inches%12;
		this->feet = feet + inches/12;

		return;
	}
	friend std::ostream& operator<<(std::ostream& os, const widget& f)
	{
		os << std::to_string(f.feet) << '\'';
		os << std::to_string(f.inches) << '"';

		return os;
	}
};

void print(std::vector<widget> a)
{
	std::cout << "contents: " << std::endl << "{ ";
	for (auto x :a){
		std::cout << x << ' ';
	}
	std::cout << "}" << std::endl;

	return;
}

int main(void)
{
	int num = 15;
	unsigned int seed = 5;

	std::vector<widget> arr;
	for(int i = 0; i < num; ++i)
		arr.emplace_back(0,i);

	print(arr);

	std::shuffle(arr.begin(), arr.end(), std::default_random_engine(seed));

	print(arr);

	return 0;
}