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 // Copyright 2008 Google Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Type utilities needed for implementing typed and type-parameterized
 // tests.
 
 // IWYU pragma: private, include "gtest/gtest.h"
 // IWYU pragma: friend gtest/.*
 // IWYU pragma: friend gmock/.*
 
 #ifndef GOOGLETEST_INCLUDE_GTEST_INTERNAL_GTEST_TYPE_UTIL_H_
 #define GOOGLETEST_INCLUDE_GTEST_INTERNAL_GTEST_TYPE_UTIL_H_
 
 #include "gtest/internal/gtest-port.h"
 
 // #ifdef __GNUC__ is too general here.  It is possible to use gcc without using
 // libstdc++ (which is where cxxabi.h comes from).
 #if GTEST_HAS_CXXABI_H_
 #include <cxxabi.h>
 #elif defined(__HP_aCC)
 #include <acxx_demangle.h>
 #endif  // GTEST_HASH_CXXABI_H_
 
 namespace testing {
 namespace internal {
 
 // Canonicalizes a given name with respect to the Standard C++ Library.
 // This handles removing the inline namespace within `std` that is
 // used by various standard libraries (e.g., `std::__1`).  Names outside
 // of namespace std are returned unmodified.
 inline std::string CanonicalizeForStdLibVersioning(std::string s) {
   static const char prefix[] = "std::__";
   if (s.compare(0, strlen(prefix), prefix) == 0) {
     std::string::size_type end = s.find("::", strlen(prefix));
     if (end != s.npos) {
       // Erase everything between the initial `std` and the second `::`.
       s.erase(strlen("std"), end - strlen("std"));
     }
   }
   return s;
 }
 
 #if GTEST_HAS_RTTI
 // GetTypeName(const std::type_info&) returns a human-readable name of type T.
 inline std::string GetTypeName(const std::type_info& type) {
   const char* const name = type.name();
 #if GTEST_HAS_CXXABI_H_ || defined(__HP_aCC)
   int status = 0;
   // gcc's implementation of typeid(T).name() mangles the type name,
   // so we have to demangle it.
 #if GTEST_HAS_CXXABI_H_
   using abi::__cxa_demangle;
 #endif  // GTEST_HAS_CXXABI_H_
   char* const readable_name = __cxa_demangle(name, nullptr, nullptr, &status);
   const std::string name_str(status == 0 ? readable_name : name);
   free(readable_name);
   return CanonicalizeForStdLibVersioning(name_str);
 #else
   return name;
 #endif  // GTEST_HAS_CXXABI_H_ || __HP_aCC
 }
 #endif  // GTEST_HAS_RTTI
 
 // GetTypeName<T>() returns a human-readable name of type T if and only if
 // RTTI is enabled, otherwise it returns a dummy type name.
 // NB: This function is also used in Google Mock, so don't move it inside of
 // the typed-test-only section below.
 template <typename T>
 std::string GetTypeName() {
 #if GTEST_HAS_RTTI
   return GetTypeName(typeid(T));
 #else
   return "<type>";
 #endif  // GTEST_HAS_RTTI
 }
 
 // A unique type indicating an empty node
 struct None {};
 
 #define GTEST_TEMPLATE_ \
   template <typename T> \
   class
 
 // The template "selector" struct TemplateSel<Tmpl> is used to
 // represent Tmpl, which must be a class template with one type
 // parameter, as a type.  TemplateSel<Tmpl>::Bind<T>::type is defined
 // as the type Tmpl<T>.  This allows us to actually instantiate the
 // template "selected" by TemplateSel<Tmpl>.
 //
 // This trick is necessary for simulating typedef for class templates,
 // which C++ doesn't support directly.
 template <GTEST_TEMPLATE_ Tmpl>
 struct TemplateSel {
   template <typename T>
   struct Bind {
     typedef Tmpl<T> type;
   };
 };
 
 #define GTEST_BIND_(TmplSel, T) TmplSel::template Bind<T>::type
 
 template <GTEST_TEMPLATE_ Head_, GTEST_TEMPLATE_... Tail_>
 struct Templates {
   using Head = TemplateSel<Head_>;
   using Tail = Templates<Tail_...>;
 };
 
 template <GTEST_TEMPLATE_ Head_>
 struct Templates<Head_> {
   using Head = TemplateSel<Head_>;
   using Tail = None;
 };
 
 // Tuple-like type lists
 template <typename Head_, typename... Tail_>
 struct Types {
   using Head = Head_;
   using Tail = Types<Tail_...>;
 };
 
 template <typename Head_>
 struct Types<Head_> {
   using Head = Head_;
   using Tail = None;
 };
 
 // Helper metafunctions to tell apart a single type from types
 // generated by ::testing::Types
 template <typename... Ts>
 struct ProxyTypeList {
   using type = Types<Ts...>;
 };
 
 template <typename>
 struct is_proxy_type_list : std::false_type {};
 
 template <typename... Ts>
 struct is_proxy_type_list<ProxyTypeList<Ts...>> : std::true_type {};
 
 // Generator which conditionally creates type lists.
 // It recognizes if a requested type list should be created
 // and prevents creating a new type list nested within another one.
 template <typename T>
 struct GenerateTypeList {
  private:
   using proxy = typename std::conditional<is_proxy_type_list<T>::value, T,
                                           ProxyTypeList<T>>::type;
 
  public:
   using type = typename proxy::type;
 };
 
 }  // namespace internal
 
 template <typename... Ts>
 using Types = internal::ProxyTypeList<Ts...>;
 
 }  // namespace testing
 
 #endif  // GOOGLETEST_INCLUDE_GTEST_INTERNAL_GTEST_TYPE_UTIL_H_

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