tobkit/libsigc++-2.2.3/tests/test_compose.cc

// -*- c++ -*-
/* Copyright 2002, The libsigc++ Development Team
 *  Assigned to public domain.  Use as you wish without restriction.
 */

#include <sigc++/adaptors/compose.h>
#include <iostream>

SIGC_USING_STD(cout)
SIGC_USING_STD(endl)

// assume existance of T_functor::result_type for unknown functor types:
namespace sigc { SIGC_FUNCTORS_HAVE_RESULT_TYPE }


struct set 
{
  // choose a type that can hold all return values
  typedef double result_type;
  double operator()(int i) 
    {std::cout << "set(int "<<i<<")"<<std::endl; return i*i;}
  double operator()(double i) 
    {std::cout << "set(double "<<i<<")"<<std::endl; return i*5;}
};

struct set_void
{
  typedef void result_type;
  void operator()(double i)
    { std::cout << "set_void(double "<<i<<")"<<std::endl; }
};

struct get
{
#ifdef SIGC_CXX_TYPEOF
  bool operator()()
    { std::cout << "get()"<<std::endl; return true; }
  int operator()(int i) 
    { std::cout << "get("<<i<<")"<<std::endl; return i*2; }
  double operator()(int i,int j) 
    { std::cout << "get("<<i<<","<<j<<")"<<std::endl; return double(i)/double(j); }
#else
  // choose a type that can hold all return values
  typedef double result_type;
  double operator()()
    { std::cout << "get()"<<std::endl; return true; }
  double operator()(int i) 
    { std::cout << "get("<<i<<")"<<std::endl; return i*2; }
  double operator()(int i,int j) 
    { std::cout << "get("<<i<<","<<j<<")"<<std::endl; return double(i)/double(j); }
#endif
};


int main()
{
  std::cout << sigc::compose(set(),get())() << std::endl;
  std::cout << sigc::compose(set(),get())(1) << std::endl;
  std::cout << sigc::compose(set(),get())(1,2) << std::endl;
  sigc::compose(set_void(),get())(3); //void test
}