iswlower.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2021 Tobias Hienzsch
 
#ifndef TETL_CWCTYPE_ISWLOWER_HPP
#define TETL_CWCTYPE_ISWLOWER_HPP
 
#include <etl/_cwchar/wint_t.hpp>
 
namespace etl {
 
/// \brief Checks if the given wide character is a lowercase letter, i.e. one of
/// abcdefghijklmnopqrstuvwxyz or any lowercase letter specific to the current
/// locale.
///
/// \details If the value of ch is neither representable as a wchar_t nor equal
/// to the value of the macro WEOF, the behavior is undefined.
///
/// https://en.cppreference.com/w/cpp/string/wide/iswlower
///
/// \ingroup cwctype
[[nodiscard]] constexpr auto iswlower(wint_t ch) noexcept -> int
{
    return static_cast<int>(ch >= L'a' && ch <= L'z');
}
 
} // namespace etl
 
#endif // TETL_CWCTYPE_ISWLOWER_HPP