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Release the spare capacity of the hash index in shrink_to_fit

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shrink_to_fit() now trims the tables of large objects like the node array and the decoded strings, and the list of large objects is released as soon as the tables are built.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Niels Lohmann committed 2026-10-17 08:31:17 +02:00
1 parent c11ba3a9df
commit a996542d3e
2 files changed
+54
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include/nlohmann/json_view.hpp
+12
View File
@@ -1015,6 +1015,8 @@ class basic_json_document
std::vector<char> arena(shrink_arena ? d.arena : std::vector<char>());
const bool shrink_nodes = d.nodes != d.inline_nodes && d.node_count != d.node_capacity;
const bool into_header = d.node_count <= d.inline_capacity;
std::vector<document_data::object_index> indexes(d.indexes.capacity() > d.indexes.size() ? d.indexes : std::vector<document_data::object_index>());
std::vector<std::uint32_t> index_slots(d.index_slots.capacity() > d.index_slots.size() ? d.index_slots : std::vector<std::uint32_t>());
node* fresh = (shrink_nodes && !into_header) ? static_cast<node*>(::operator new (d.node_count * sizeof(node))) : d.inline_nodes;
if (shrink_nodes)
@@ -1032,6 +1034,14 @@ class basic_json_document
d.arena.swap(arena);
d.base[1] = d.arena.data();
}
if (d.indexes.capacity() > d.indexes.size())
{
d.indexes.swap(indexes);
}
if (d.index_slots.capacity() > d.index_slots.size())
{
d.index_slots.swap(index_slots);
}
}
private:
@@ -1110,9 +1120,11 @@ class basic_json_document
d.base[0] = d.src;
d.base[1] = d.arena.data();
detail::view::build_object_indexes(d);
std::vector<std::uint32_t>().swap(d.large_objects); // (only needed while parsing)
d.discarded = false;
return;
}
std::vector<std::uint32_t>().swap(d.large_objects);
if (allow_exceptions)
{
detail::view::throw_parse_failure<BasicJsonType>(failure, src, size, comments, trailing_commas);