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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. #include <boost/utility/enable_if.hpp>
  5.  #include <boost/type_traits/is_same.hpp>
  6.  
  7. typedef unsigned int UINT;
  8.  
  9. //Foo.h
  10. template <typename T>
  11. struct returnThis {};
  12.  
  13. class Foo
  14. {
  15. public:
  16.  
  17.     template <typename T>
  18.     typename boost::enable_if<boost::is_same<T,float>,returnThis<float>*>::type 
  19.     bar();
  20.  
  21.     template <typename T>
  22.     typename boost::enable_if_c<boost::is_same<T,UINT>::value and boost::is_same<UINT,unsigned int>::value,
  23.     returnThis<UINT>*>::type 
  24.     bar();
  25.  
  26.     template <typename T>
  27.     typename boost::enable_if_c<boost::is_same<T,UINT>::value and not boost::is_same<UINT,unsigned int>::value,
  28.              returnThis<UINT>*>::type 
  29.     bar();
  30. };
  31.  
  32.  
  33. int main() {
  34. 	Foo f;
  35. 	f.bar<float>();
  36. 	f.bar<UINT>();
  37. 	return 0;
  38. }
  39.  
  40.  
  41. // cppfile
  42.     template <typename T>
  43.     typename boost::enable_if<boost::is_same<T,float>,returnThis<float>*>::type 
  44.     Foo::bar()
  45.     {
  46.        	cout << "bar<T==float>()\n";
  47.        	return 0;
  48.     }
  49.  
  50.     template <typename T>
  51.     typename boost::enable_if_c<boost::is_same<T,UINT>::value and boost::is_same<UINT,unsigned int>::value,
  52.     returnThis<UINT>*>::type 
  53.     Foo::bar()
  54.     {
  55.       	cout << "bar<T==UINT and UINT==usigned int>()\n";
  56.        	return 0;
  57.     }
  58.  
  59.     template <typename T>
  60.     typename boost::enable_if_c<boost::is_same<T,UINT>::value and not boost::is_same<UINT,unsigned int>::value,
  61.     returnThis<UINT>*>::type 
  62.     Foo::bar()
  63.     {
  64.        	cout << "bar<T==UINT and UINT!=usigned int>()\n";
  65.        	return 0;
  66.     }
  67.  
  68.  
  69. 	template returnThis<float>* Foo::bar<float>();
  70. 	template returnThis<UINT>* Foo::bar<UINT>();
Success #stdin #stdout 0s 3140KB
comments (?)
stdin 
Standard input is empty
stdout 
bar<T==float>()
bar<T==UINT and UINT==usigned int>()
https://ideone.com/GrMVih
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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