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  1. #include <iostream>
  2. #include <string>
  3. #include <vector>
  4. #include <typeinfo>
  5.  
  6. template<template<typename, typename> class T, typename T_T, typename T_U>
  7. void func(T<T_T, T_U> t) {
  8.     typename decltype(t)::iterator t_it;
  9.     typename T<T_T, T_U>::iterator t_it2;
  10.     std::cout << "* Passed as: "
  11.               << typeid(T<T_T, T_U>).name() << '\n'
  12.               << "** With element type: "
  13.               << typeid(T_T).name() << '\n'
  14.               << "** And allocator type: "
  15.               << typeid(T_U).name() << '\n'
  16.               << "** And iterator type: "
  17.               << typeid(t_it).name() << '\n'
  18.               << "                     (" << typeid(t_it2).name() << ")"
  19.               << std::endl;
  20. }
  21.  
  22. template<typename T>
  23. void cnuf(T t) {
  24.     std::cout << "* And as: "
  25.               << typeid(T).name() << '\n'
  26.               << "* With iterator type: "
  27.               << typeid(typename T::iterator).name()
  28.               << std::endl;
  29. }
  30.  
  31. int main() {
  32.     std::vector<int> vIntA;
  33.     std::vector<int, std::allocator<std::string>> vStrA;
  34.  
  35.     decltype(vIntA)::iterator vII;
  36.     decltype(vStrA)::iterator vSI;
  37.  
  38.     std::cout << "First vector: \n"
  39.               << "* " << typeid(decltype(vIntA)).name() << '\n'
  40.               << "* Allocator: "
  41.               << typeid(decltype(vIntA)::allocator_type).name() << '\n'
  42.               << "* Iterator: "
  43.               << typeid(vII).name() << std::endl;
  44.     func(vIntA);
  45.     cnuf(vIntA);
  46.     std::cout << std::endl;
  47.  
  48.  
  49.     std::cout << "Second vector: \n"
  50.               << "* " << typeid(decltype(vStrA)).name() << '\n'
  51.               << "* Allocator: "
  52.               << typeid(decltype(vStrA)::allocator_type).name() << '\n'
  53.               << "* Iterator: "
  54.               << typeid(vSI).name() << std::endl;
  55.     func(vStrA);
  56.     cnuf(vStrA);
  57. }
Success #stdin #stdout 0s 3464KB
comments (?)
stdin
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Standard input is empty
stdout
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First vector: 
* St6vectorIiSaIiEE
* Allocator: SaIiE
* Iterator: N9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEE
* Passed as: St6vectorIiSaIiEE
** With element type: i
** And allocator type: SaIiE
** And iterator type: N9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEE
                     (N9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEE)
* And as: St6vectorIiSaIiEE
* With iterator type: N9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEE

Second vector: 
* St6vectorIiSaISsEE
* Allocator: SaISsE
* Iterator: N9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaISsEEEE
* Passed as: St6vectorIiSaISsEE
** With element type: i
** And allocator type: SaISsE
** And iterator type: N9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaISsEEEE
                     (N9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaISsEEEE)
* And as: St6vectorIiSaISsEE
* With iterator type: N9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaISsEEEE
https://ideone.com/MLHhCa
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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