#include <type_traits>
#include <utility>
+#include <folly/Portability.h>
#include <folly/Range.h>
#include <folly/Utility.h>
#include <folly/portability/BitsFunctexcept.h>
#include <folly/portability/Constexpr.h>
-// Define FOLLY_USE_CPP14_CONSTEXPR to be true if the compiler's C++14
-// constexpr support is "good enough".
-#ifndef FOLLY_USE_CPP14_CONSTEXPR
-#if defined(__clang__)
-#define FOLLY_USE_CPP14_CONSTEXPR __cplusplus >= 201300L
-#elif defined(__GNUC__)
-#define FOLLY_USE_CPP14_CONSTEXPR __cplusplus >= 201304L
-#else
-#define FOLLY_USE_CPP14_CONSTEXPR 0 // MSVC?
-#endif
-#endif
-
-#if FOLLY_USE_CPP14_CONSTEXPR
-#define FOLLY_CPP14_CONSTEXPR constexpr
-#else
-#define FOLLY_CPP14_CONSTEXPR inline
-#endif
-
namespace folly {
template <class Char, std::size_t N>