1//===-- Implementation header for nan ---------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_NAN_H
10#define LLVM_LIBC_SRC___SUPPORT_MATH_NAN_H
11
12#include "src/__support/libc_errno.h"
13#include "src/__support/macros/config.h"
14#include "src/__support/str_to_float.h"
15
16namespace LIBC_NAMESPACE_DECL {
17namespace math {
18
19LIBC_INLINE constexpr double nan(const char *arg) {
20 auto result = internal::strtonan<double>(arg);
21 if (result.has_error())
22 libc_errno = result.error;
23 return result.value;
24}
25
26} // namespace math
27} // namespace LIBC_NAMESPACE_DECL
28
29#endif // LLVM_LIBC_SRC___SUPPORT_MATH_NAN_H
30