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//===-- A self contained equivalent of <limits> ----------------*- 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_LIMITS_H
#define LLVM_LIBC_SRC___SUPPORT_CPP_LIMITS_H
#include "hdr/limits_macros.h" // CHAR_BIT
#include "src/__support/CPP/type_traits/is_integral.h"
#include "src/__support/CPP/type_traits/is_signed.h"
#include "src/__support/macros/attributes.h" // LIBC_INLINE
namespace LIBC_NAMESPACE_DECL {
namespace cpp {
namespace internal {
template <typename T, bool is_integral> struct numeric_limits_impl {};
template <typename T> struct numeric_limits_impl<T, true> {
LIBC_INLINE_VAR static constexpr bool is_signed = T(-1) < T(0);
LIBC_INLINE_VAR static constexpr int digits =
(CHAR_BIT * sizeof(T)) - is_signed;
LIBC_INLINE static constexpr T min() {
if constexpr (is_signed) {
return T(T(1) << digits);
} else {
return 0;
}
}
LIBC_INLINE static constexpr T max() {
if constexpr (is_signed) {
return T(T(~0) ^ min());
} else {
return T(~0);
}
}
};
} // namespace internal
template <typename T>
struct numeric_limits
: public internal::numeric_limits_impl<T, is_integral_v<T>> {};
} // namespace cpp
} // namespace LIBC_NAMESPACE_DECL
#endif // LLVM_LIBC_SRC___SUPPORT_CPP_LIMITS_H
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