A todo() macro for C++, inspired by Rusts todo!()

todo.cpp

#include <iostream>

struct todo_statement {
 public:
  todo_statement(const char* file, const int line)
      : m_file(file), m_line(line) {}

  template <typename T>
  operator T() {
    std::cerr << "Error: Remove todo() statement in " << m_file << ":" << m_line
              << std::endl;
    throw;
  }

  const char* m_file;
  const int m_line;
};

#define todo() (todo_statement{__FILE__, __LINE__})

The idea is that you can put todo() in places where you still need to write some code. Due to the generic operator T() implementation, the resulting expression can be cast into any type. At least during compile time.