Fix copyright lines

[folly.git] / folly / portability / Constexpr.h

diff --git a/folly/portability/Constexpr.h b/folly/portability/Constexpr.h
old mode 100755 (executable)
new mode 100644 (file)
index 16b6458..9e7963c
--- a/folly/portability/Constexpr.h
+++ b/folly/portability/Constexpr.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 Facebook, Inc.
+ * Copyright 2016-present Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,74 +22,30 @@
 
 namespace folly {
 
-template <typename T>
-constexpr T constexpr_max(T a, T b) {
-  return a > b ? a : b;
-}
-
-template <typename T>
-constexpr T constexpr_min(T a, T b) {
-  return a < b ? a : b;
-}
-
 namespace detail {
 
-template <typename T, typename = void>
-struct constexpr_abs_helper {};
-
-template <typename T>
-struct constexpr_abs_helper<
-    T,
-    typename std::enable_if<std::is_floating_point<T>::value>::type> {
-  static constexpr T go(T t) {
-    return t < static_cast<T>(0) ? -t : t;
-  }
-};
-
-template <typename T>
-struct constexpr_abs_helper<
-    T,
-    typename std::enable_if<
-        std::is_integral<T>::value && !std::is_same<T, bool>::value &&
-        std::is_unsigned<T>::value>::type> {
-  static constexpr T go(T t) {
-    return t;
-  }
-};
-
-template <typename T>
-struct constexpr_abs_helper<
-    T,
-    typename std::enable_if<
-        std::is_integral<T>::value && !std::is_same<T, bool>::value &&
-        std::is_signed<T>::value>::type> {
-  static constexpr typename std::make_unsigned<T>::type go(T t) {
-    return t < static_cast<T>(0) ? -t : t;
-  }
-};
-}
-
-template <typename T>
-constexpr auto constexpr_abs(T t)
-    -> decltype(detail::constexpr_abs_helper<T>::go(t)) {
-  return detail::constexpr_abs_helper<T>::go(t);
+template <typename Char>
+constexpr size_t constexpr_strlen_internal(const Char* s, size_t len) {
+  return *s == Char(0) ? len : constexpr_strlen_internal(s + 1, len + 1);
 }
-
-#ifdef _MSC_VER
-constexpr size_t constexpr_strlen_internal(const char* s, size_t len) {
-  return *s == '\0' ? len : constexpr_strlen_internal(s + 1, len + 1);
+static_assert(
+    constexpr_strlen_internal("123456789", 0) == 9,
+    "Someone appears to have broken constexpr_strlen...");
+} // namespace detail
+
+template <typename Char>
+constexpr size_t constexpr_strlen(const Char* s) {
+  return detail::constexpr_strlen_internal(s, 0);
 }
-static_assert(constexpr_strlen_internal("123456789", 0) == 9,
-              "Someone appears to have broken constexpr_strlen...");
-#endif
 
+template <>
 constexpr size_t constexpr_strlen(const char* s) {
 #if defined(__clang__)
   return __builtin_strlen(s);
-#elif defined(_MSC_VER)
-  return s == nullptr ? 0 : constexpr_strlen_internal(s, 0);
+#elif defined(_MSC_VER) || defined(__CUDACC__)
+  return detail::constexpr_strlen_internal(s, 0);
 #else
   return std::strlen(s);
 #endif
 }
-}
+} // namespace folly