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#include <iostream>
#include <set>
 
using namespace std;
 
std::set<int, struct {
    bool operator ()(const int* a, const int* b) const
    {
       return *a < *b;
    }
	}> test;
 
int main()
{
	std::cout << test.size();
}

prog.cpp:6:22: error: types may not be defined in template arguments
 std::set<int, struct {
                      ^
prog.cpp:11:2: error: expected ‘;’ after struct definition
  }> test;
  ^
prog.cpp:11:2: error: expected template-argument before ‘;’ token
prog.cpp:11:2: error: expected ‘>’ before ‘;’ token
prog.cpp:11:2: error: expected ‘::’ before ‘;’ token
prog.cpp:11:2: error: expected unqualified-id before ‘;’ token
prog.cpp:11:2: error: declaration does not declare anything [-fpermissive]
prog.cpp:11:3: error: expected unqualified-id before ‘>’ token
  }> test;
   ^
prog.cpp: In function ‘int main()’:
prog.cpp:15:15: error: ‘test’ was not declared in this scope
  std::cout << test.size();
               ^

Standard output is empty