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 7ea4630..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.
@@ -14,41 +14,38 @@
  * limitations under the License.
  */
 
-#ifndef FOLLY_CONSTEXPR_H_
-#define FOLLY_CONSTEXPR_H_
+#pragma once
 
 #include <cstdint>
 #include <cstring>
+#include <type_traits>
 
 namespace folly {
 
-template <typename T>
-constexpr T constexpr_max(T a, T b) {
-  return a > b ? a : b;
-}
+namespace detail {
 
-template <typename T>
-constexpr T constexpr_min(T a, T b) {
-  return a < b ? a : b;
+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
 }
-}
-
-#endif
+} // namespace folly