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Diffstat (limited to 'third_party/base/template_util.h')
-rw-r--r-- | third_party/base/template_util.h | 79 |
1 files changed, 0 insertions, 79 deletions
diff --git a/third_party/base/template_util.h b/third_party/base/template_util.h deleted file mode 100644 index 719f3f1c3a..0000000000 --- a/third_party/base/template_util.h +++ /dev/null @@ -1,79 +0,0 @@ -// Copyright (c) 2011 The Chromium Authors. All rights reserved. -// Use of this source code is governed by a BSD-style license that can be -// found in the LICENSE file. - -#ifndef PDFIUM_THIRD_PARTY_BASE_TEMPLATE_UTIL_H_ -#define PDFIUM_THIRD_PARTY_BASE_TEMPLATE_UTIL_H_ - -#include <cstddef> // For size_t. - -namespace pdfium { -namespace base { - -template<class T, T v> -struct integral_constant { - static const T value = v; - typedef T value_type; - typedef integral_constant<T, v> type; -}; - -typedef integral_constant<bool, true> true_type; -typedef integral_constant<bool, false> false_type; - -template <class T, class U> struct is_same : public false_type {}; -template <class T> -struct is_same<T, T> : true_type {}; - -template<bool B, class T = void> -struct enable_if {}; - -template<class T> -struct enable_if<true, T> { typedef T type; }; - -namespace internal { - -// Types YesType and NoType are guaranteed such that sizeof(YesType) < -// sizeof(NoType). -typedef char YesType; - -struct NoType { - YesType dummy[2]; -}; - -// This class is an implementation detail for is_convertible, and you -// don't need to know how it works to use is_convertible. For those -// who care: we declare two different functions, one whose argument is -// of type To and one with a variadic argument list. We give them -// return types of different size, so we can use sizeof to trick the -// compiler into telling us which function it would have chosen if we -// had called it with an argument of type From. See Alexandrescu's -// _Modern C++ Design_ for more details on this sort of trick. - -struct ConvertHelper { - template <typename To> - static YesType Test(To); - - template <typename To> - static NoType Test(...); - - template <typename From> - static From& Create(); -}; - -} // namespace internal - -// Inherits from true_type if From is convertible to To, false_type otherwise. -// -// Note that if the type is convertible, this will be a true_type REGARDLESS -// of whether or not the conversion would emit a warning. -template <typename From, typename To> -struct is_convertible - : integral_constant<bool, - sizeof(internal::ConvertHelper::Test<To>( - internal::ConvertHelper::Create<From>())) == - sizeof(internal::YesType)> {}; - -} // namespace base -} // namespace pdfium - -#endif // PDFIUM_THIRD_PARTY_BASE_TEMPLATE_UTIL_H_ |