Non-polymorphic destructor leak

main.cpp

#include <iostream>
#include <memory>

class foo {
public:
  foo(int a)
  : a(a) {
    std::cout << "foo(" << this->a << ")\n";
  }
  ~foo() {
    std::cout << "~foo(" << this->a << ")\n";
  }
  int a;
};

class bar : public foo {
public:
  bar(int a)
  : foo(a), data(new char[4 * 1024 * 1024]) {
    std::cout << "bar(" << this->a << ")\n";
  }
  ~bar() {
    std::cout << "~bar(" << this->a << ")\n";
    delete[] this->data;
  }
private:
  char* data;
};

int main() {
  foo a(0);
  bar b(1);
  std::unique_ptr<foo> c(new foo(2));
  std::unique_ptr<foo> d(new bar(3)); // does not call ~bar()
  std::unique_ptr<bar> e(new bar(4));
  return 0;
}

Makefile

check: main
  valgrind --tool=memcheck --leak-check=yes ./main
main: main.cpp
  g++ main.cpp -o main -std=c++11