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#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
 
class Foo
{
	public:
	Foo()
	{
 
	}
 
	Foo(Foo &)
	{
		std::cout <<"!";
	}
 
	Foo(Foo &&)
	{
		std::cout << "!!";
	}
};
 
int main() {
	std::vector<Foo> v(1);
	std::generate(v.begin(), v.end(), [](){return Foo();});
	return 0;
}

In file included from /usr/include/c++/8/algorithm:62,
                 from prog.cpp:2:
/usr/include/c++/8/bits/stl_algo.h: In instantiation of ‘void std::generate(_FIter, _FIter, _Generator) [with _FIter = __gnu_cxx::__normal_iterator<Foo*, std::vector<Foo> >; _Generator = main()::<lambda()>]’:
prog.cpp:27:55:   required from here
/usr/include/c++/8/bits/stl_algo.h:4436:11: error: use of deleted function ‘constexpr Foo& Foo::operator=(const Foo&)’
  *__first = __gen();
  ~~~~~~~~~^~~~~~~~~
prog.cpp:6:7: note: ‘constexpr Foo& Foo::operator=(const Foo&)’ is implicitly declared as deleted because ‘Foo’ declares a move constructor or move assignment operator
 class Foo
       ^~~

Standard output is empty