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  1. #include <deque>
  2. #include <forward_list>
  3. #include <list>
  4. #include <map>
  5. #include <queue>
  6. #include <set>
  7. #include <stack>
  8. #include <string>
  9. #include <tuple>
  10. #include <type_traits>
  11. #include <unordered_map>
  12. #include <unordered_set>
  13. #include <utility>
  14. #include <vector>
  15. #include <type_traits>
  16. #include <iostream>
  17.  
  18. //specialize a type for all of the STL containers.
  19. namespace is_stl_container_impl{
  20.   template <typename T>       struct is_stl_container:std::false_type{};
  21.   template <typename... Args> struct is_stl_container<std::array             <Args...>>:std::true_type{};
  22.   template <typename... Args> struct is_stl_container<std::vector            <Args...>>:std::true_type{};
  23.   template <typename... Args> struct is_stl_container<std::deque             <Args...>>:std::true_type{};
  24.   template <typename... Args> struct is_stl_container<std::list              <Args...>>:std::true_type{};
  25.   template <typename... Args> struct is_stl_container<std::forward_list      <Args...>>:std::true_type{};
  26.   template <typename... Args> struct is_stl_container<std::set               <Args...>>:std::true_type{};
  27.   template <typename... Args> struct is_stl_container<std::multiset          <Args...>>:std::true_type{};
  28.   template <typename... Args> struct is_stl_container<std::map               <Args...>>:std::true_type{};
  29.   template <typename... Args> struct is_stl_container<std::multimap          <Args...>>:std::true_type{};
  30.   template <typename... Args> struct is_stl_container<std::unordered_set     <Args...>>:std::true_type{};
  31.   template <typename... Args> struct is_stl_container<std::unordered_multiset<Args...>>:std::true_type{};
  32.   template <typename... Args> struct is_stl_container<std::unordered_map     <Args...>>:std::true_type{};
  33.   template <typename... Args> struct is_stl_container<std::unordered_multimap<Args...>>:std::true_type{};
  34.   template <typename... Args> struct is_stl_container<std::stack             <Args...>>:std::true_type{};
  35.   template <typename... Args> struct is_stl_container<std::queue             <Args...>>:std::true_type{};
  36.   template <typename... Args> struct is_stl_container<std::priority_queue    <Args...>>:std::true_type{};
  37. }
  38.  
  39. //type trait to utilize the implementation type traits as well as decay the type
  40. template <typename T> struct is_stl_container {
  41.   static constexpr bool const value = is_stl_container_impl::is_stl_container<std::decay_t<T>>::value;
  42. };
  43.  
  44. int main(){
  45.   std::cout << std::boolalpha;
  46.   std::cout << is_stl_container<std::vector<int>>::value << '\n';
  47.   std::cout << is_stl_container<std::vector<int>const&>::value << '\n';
  48.   std::cout << is_stl_container<int>::value << '\n';
  49. }
Success #stdin #stdout 0s 3460KB
comments (?)
stdin 
Standard input is empty
stdout 
true
true
false
https://ideone.com/PuD98p
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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