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  1. #include <iostream>
  2. #include <string>
  3.  
  4. #include <boost/variant.hpp>
  5.  
  6. void foo( boost::variant<int,long,std::string> arg )
  7. {
  8.     using namespace std;
  9.  
  10.     cout << "foo: ";
  11.     switch( arg.which() ) {
  12.     case 0:
  13.         cout << "<int> " << boost::get<int>(arg) << endl;
  14.         break;
  15.     case 1:
  16.         cout << "<long> " << boost::get<long>(arg) << endl;
  17.         break;
  18.     case 2:
  19.         cout << "<string> " << boost::get<std::string>(arg) << endl;
  20.         break;
  21.     }
  22. }
  23.  
  24. int main() {
  25.  
  26.     foo( 1 );
  27.     foo( 2L );
  28.     foo( std::string("hello world") );
  29.     //foo( 3u ); // compile error
  30. }
  31.  
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https://ideone.com/OvG0LQ
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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