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buffer initializer_list before reallocation in array::insert #1174

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buffer initializer_list before reallocation in array::insert #1174

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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 initializer_list elements may reference elements of this
// array, whose storage revert_insert can relocate and free, so
// materialise them into a temporary before inserting
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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21 changes: 21 additions & 0 deletions test/array.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1048,6 +1048,27 @@ class array_test
BOOST_TEST(a[4].as_int64() == 4);
});

// init_list elements alias elements and insertion reallocates
fail_loop([&](storage_ptr const& sp)
{
array a(sp);
a.reserve(4);
a.emplace_back(1);
a.emplace_back(2);
a.emplace_back(3);
a.emplace_back(4);
BOOST_TEST(a.capacity() == a.size());
a.insert(a.begin(), {a[3], a[0]});
BOOST_TEST(a.size() == 6);
BOOST_TEST(a[0].as_int64() == 4);
BOOST_TEST(a[1].as_int64() == 1);
BOOST_TEST(a[2].as_int64() == 1);
BOOST_TEST(a[3].as_int64() == 2);
BOOST_TEST(a[4].as_int64() == 3);
BOOST_TEST(a[5].as_int64() == 4);
check_storage(a, sp);
});

// emplace(const_iterator, arg)
fail_loop([&](storage_ptr const& sp)
{
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