update boost

linx64/include/boost/json/detail/impl/stack.ipp

@@ -0,0 +1,62 @@
+//
+// 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/json
+//
+
+#ifndef BOOST_JSON_DETAIL_IMPL_STACK_IPP
+#define BOOST_JSON_DETAIL_IMPL_STACK_IPP
+
+#include <boost/json/detail/stack.hpp>
+
+namespace boost {
+namespace json {
+namespace detail {
+
+stack::
+~stack()
+{
+    if(base_ != buf_)
+        sp_->deallocate(
+            base_, cap_);
+}
+
+stack::
+stack(
+    storage_ptr sp,
+    unsigned char* buf,
+    std::size_t buf_size) noexcept
+    : sp_(std::move(sp))
+    , cap_(buf_size)
+    , base_(buf)
+    , buf_(buf)
+{
+}
+
+void
+stack::
+reserve(std::size_t n)
+{
+    if(cap_ >= n)
+        return;
+    auto const base = static_cast<
+        unsigned char*>(sp_->allocate(n));
+    if(base_)
+    {
+        if(size_ > 0)
+            std::memcpy(base, base_, size_);
+        if(base_ != buf_)
+            sp_->deallocate(base_, cap_);
+    }
+    base_ = base;
+    cap_ = n;
+}
+
+} // detail
+} // namespace json
+} // namespace boost
+
+#endif