Added thirdparty: boost library

thirdparty/include/boost/url/detail/move_chars.hpp

@@ -0,0 +1,90 @@
+//
+// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// Official repository: https://github.com/boostorg/url
+//
+
+#ifndef BOOST_URL_DETAIL_MOVE_CHARS_HPP
+#define BOOST_URL_DETAIL_MOVE_CHARS_HPP
+
+#include <boost/core/detail/string_view.hpp>
+#include <boost/assert.hpp>
+#include <cstring>
+#include <functional>
+
+namespace boost {
+namespace urls {
+namespace detail {
+
+// Moves characters, and adjusts any passed
+// views if they point to any moved characters.
+
+// true if s completely overlapped by buf
+inline
+bool
+is_overlapping(
+    core::string_view buf,
+    core::string_view s) noexcept
+{
+    auto const b0 = buf.data();
+    auto const e0 = b0 + buf.size();
+    auto const b1 = s.data();
+    auto const e1 = b1 + s.size();
+    auto const less_equal =
+        std::less_equal<char const*>();
+    if(less_equal(e0, b1))
+        return false;
+    if(less_equal(e1, b0))
+        return false;
+    // partial overlap is undefined
+    BOOST_ASSERT(less_equal(e1, e0));
+    BOOST_ASSERT(less_equal(b0, b1));
+    return true;
+}
+
+inline
+void
+move_chars_impl(
+    std::ptrdiff_t,
+    core::string_view const&) noexcept
+{
+}
+
+template<class... Sn>
+void
+move_chars_impl(
+    std::ptrdiff_t d,
+    core::string_view const& buf,
+    core::string_view& s,
+    Sn&... sn) noexcept
+{
+    if(is_overlapping(buf, s))
+        s = {s.data() + d, s.size()};
+    move_chars_impl(d, buf, sn...);
+}
+
+template<class... Args>
+void
+move_chars(
+    char* dest,
+    char const* src,
+    std::size_t n,
+    Args&... args) noexcept
+{
+    core::string_view buf(src, n);
+    move_chars_impl(
+        dest - src,
+        core::string_view(src, n),
+        args...);
+    std::memmove(
+        dest, src, n);
+}
+
+} // detail
+} // urls
+} // boost
+
+#endif