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buffer initializer_list before reallocation in array::insert #1174

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Merged
grisumbras merged 2 commits into from
Sep 11, 2026
Merged

buffer initializer_list before reallocation in array::insert #1174

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3cf6204
buffer initializer_list before reallocation in array::insert
Ramya-9353 Aug 27, 2026
6e33933
drop redundant assert and empty-list branch in array::insert
Ramya-9353 Sep 10, 2026
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13 changes: 10 additions & 3 deletions include/boost/json/impl/array.ipp
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Original file line number Diff line number Diff line change
Expand Up @@ -516,10 +516,17 @@ insert(
value_ref> init) ->
iterator
{
// the value_refs in init may point into this
// array, whose storage revert_insert can
// relocate and free, so buffer them first
array temp(init, sp_);
revert_insert r(
pos, init.size(), *this);
value_ref::write_array(
r.p, init, sp_);
pos, temp.size(), *this);
relocate(
r.p,
temp.data(),
temp.size());
temp.t_->size = 0;
return r.commit();
}

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12 changes: 12 additions & 0 deletions test/array.cpp
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Expand Up @@ -1046,6 +1046,18 @@ class array_test
BOOST_TEST(a[2].as_string() == str_);
BOOST_TEST(a[3].as_int64() == 3);
BOOST_TEST(a[4].as_int64() == 4);

// elements of init alias *this and
// insertion reallocates
array b({1, str_}, sp);
BOOST_TEST(b.capacity() == b.size());
b.insert(b.begin(), {b[0], b[1]});
BOOST_TEST(b.size() == 4);
BOOST_TEST(b[0].as_int64() == 1);
BOOST_TEST(b[1].as_string() == str_);
BOOST_TEST(b[2].as_int64() == 1);
BOOST_TEST(b[3].as_string() == str_);
check_storage(b, sp);
});

// emplace(const_iterator, arg)
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