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//===- llvm/Support/type_traits.h - Simplfied type traits -------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides useful additions to the standard type_traits library.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_TYPE_TRAITS_H
#define LLVM_SUPPORT_TYPE_TRAITS_H
#include <type_traits>
#include <utility>
#ifndef __has_feature
#define LLVM_DEFINED_HAS_FEATURE
#define __has_feature(x) 0
#endif
namespace llvm {
/// isPodLike - This is a type trait that is used to determine whether a given
/// type can be copied around with memcpy instead of running ctors etc.
template <typename T>
struct isPodLike {
#if __has_feature(is_trivially_copyable)
// If the compiler supports the is_trivially_copyable trait use it, as it
// matches the definition of isPodLike closely.
static const bool value = __is_trivially_copyable(T);
#else
// If we don't know anything else, we can (at least) assume that all non-class
// types are PODs.
static const bool value = !std::is_class<T>::value;
#endif
};
// std::pair's are pod-like if their elements are.
template<typename T, typename U>
struct isPodLike<std::pair<T, U> > {
static const bool value = isPodLike<T>::value && isPodLike<U>::value;
};
/// \brief Metafunction that determines whether the given type is either an
/// integral type or an enumeration type.
///
/// Note that this accepts potentially more integral types than is_integral
/// because it is based on merely being convertible implicitly to an integral
/// type.
template <typename T> class is_integral_or_enum {
typedef typename std::remove_reference<T>::type UnderlyingT;
public:
static const bool value =
!std::is_class<UnderlyingT>::value && // Filter conversion operators.
!std::is_pointer<UnderlyingT>::value &&
!std::is_floating_point<UnderlyingT>::value &&
std::is_convertible<UnderlyingT, unsigned long long>::value;
};
/// \brief If T is a pointer, just return it. If it is not, return T&.
template<typename T, typename Enable = void>
struct add_lvalue_reference_if_not_pointer { typedef T &type; };
template <typename T>
struct add_lvalue_reference_if_not_pointer<
T, typename std::enable_if<std::is_pointer<T>::value>::type> {
typedef T type;
};
/// \brief If T is a pointer to X, return a pointer to const X. If it is not,
/// return const T.
template<typename T, typename Enable = void>
struct add_const_past_pointer { typedef const T type; };
template <typename T>
struct add_const_past_pointer<
T, typename std::enable_if<std::is_pointer<T>::value>::type> {
typedef const typename std::remove_pointer<T>::type *type;
};
}
#ifdef LLVM_DEFINED_HAS_FEATURE
#undef __has_feature
#endif
#endif
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