find.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2024 Tobias Hienzsch
 
#ifndef TETL_STRINGS_FIND_HPP
#define TETL_STRINGS_FIND_HPP
 
#include <etl/_string_view/basic_string_view.hpp>
 
namespace etl::strings {
 
template <typename Char, typename Traits>
[[nodiscard]] constexpr auto find(
    basic_string_view<Char, Traits> haystack,
    basic_string_view<Char, Traits> needle,
    typename basic_string_view<Char, Traits>::size_type pos = 0
) noexcept -> typename basic_string_view<Char, Traits>::size_type
{
    if (needle.size() == 0 and pos <= haystack.size()) {
        return pos;
    }
 
    if (pos <= haystack.size() - needle.size()) {
        return haystack.find(needle, pos);
    }
 
    return basic_string_view<Char, Traits>::npos;
}
 
} // namespace etl::strings
 
#endif // TETL_STRINGS_FIND_HPP