检查类是否是模板特化?
如何检查给定类型是否是特定类模板的特化?例如，给定
How can I check if a given type is a specialization of a particular class template? For instance, given
template <class T>
struct A {};
如何检查 CompareT 是否是以下某种类型 * 的 A<*>:
How can I check if CompareT is an A<*> for some type * in the following:
template<class CompareT>
void compare(){
// is this A ?
cout << is_same< A<*> , CompareT >::value; // A<*> ????
}
int main(){
compare< A<int> >();
}
例如，这里 A 应该匹配 A<*> 并打印 1.
For example, here A<int> should match A<*> and print 1.
推荐答案
您可以在此处提供要匹配的模板:
Here's one where you can provide the template to be matched against :
template <class T, template <class...> class Template>
struct is_specialization : std::false_type {};
template <template <class...> class Template, class... Args>
struct is_specialization<Template<Args...>, Template> : std::true_type {};
static_assert(is_specialization<std::vector<int>, std::vector>{}, "");
static_assert(!is_specialization<std::vector<int>, std::list>{}, "");
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