[libc] add the CPP algorithm header for min/max

Reviewed By: jhuber6, sivachandra

Differential Revision: https://reviews.llvm.org/D157405

1 files changed, 31 insertions, 0 deletions

diff --git a/libc/src/__support/CPP/algorithm.h b/libc/src/__support/CPP/algorithm.h
new file mode 100644
index 000000000000..6b17f58ea462
--- /dev/null
+++ b/libc/src/__support/CPP/algorithm.h
@@ -0,0 +1,31 @@
+//===-- A self contained equivalent of <algorithm> --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// This file is minimalist on purpose but can receive a few more function if
+// they prove useful.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_SUPPORT_CPP_ALGORITHM_H
+#define LLVM_LIBC_SRC_SUPPORT_CPP_ALGORITHM_H
+
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+
+namespace __llvm_libc {
+namespace cpp {
+
+template <class T> LIBC_INLINE constexpr const T &max(const T &a, const T &b) {
+  return (a < b) ? b : a;
+}
+
+template <class T> LIBC_INLINE constexpr const T &min(const T &a, const T &b) {
+  return (a < b) ? a : b;
+}
+
+} // namespace cpp
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_SUPPORT_CPP_ALGORITHM_H