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2.2.6: share push_back array bodies via push_back_array_impl (#5891)

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Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann committed 2026-10-23 10:29:18 +02:00
1 parent 390ebc91b9
commit 38147ab676
1 file changed
+25 -32
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include/nlohmann/json.hpp
+25 -32
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@@ -3089,6 +3089,29 @@ public:
assert_invariant();
}
/// append @a val (moved or copied) to the array; a null value becomes an array
template<typename ValueType>
JSON_HEDLEY_ALWAYS_INLINE
void push_back_array_impl(ValueType&& val)
{
// push_back only works for null objects or arrays
if (JSON_HEDLEY_UNLIKELY(!(is_null() || is_array())))
{
detail::throw_cannot_use_with(detail::exception_id::push_back_wrong_type, "push_back()", *this);
}
// transform a null object into an array
if (is_null())
{
convert_null_to<array_t>();
}
// add the element to the array
const auto old_capacity = container_capacity();
m_data.m_value.array->push_back(std::forward<ValueType>(val));
set_parent_after_insert(m_data.m_value.array->back(), old_capacity);
}
/// @throw out_of_range.401 always, as @a idx is out of range of @a j
JSON_HEDLEY_NO_RETURN JSON_HEDLEY_NEVER_INLINE
static void throw_array_index_out_of_range(size_type idx, const basic_json& j)
@@ -4717,22 +4740,7 @@ public:
/// @sa https://json.nlohmann.me/api/basic_json/push_back/
void push_back(basic_json&& val)
{
// push_back only works for null objects or arrays
if (JSON_HEDLEY_UNLIKELY(!(is_null() || is_array())))
{
detail::throw_cannot_use_with(detail::exception_id::push_back_wrong_type, "push_back()", *this);
}
// transform a null object into an array
if (is_null())
{
convert_null_to<array_t>();
}
// add the element to the array (move semantics)
const auto old_capacity = container_capacity();
m_data.m_value.array->push_back(std::move(val));
set_parent_after_insert(m_data.m_value.array->back(), old_capacity);
push_back_array_impl(std::move(val));
// if val is moved from, basic_json move constructor marks it null, so we do not call the destructor
}
@@ -4748,22 +4756,7 @@ public:
/// @sa https://json.nlohmann.me/api/basic_json/push_back/
void push_back(const basic_json& val)
{
// push_back only works for null objects or arrays
if (JSON_HEDLEY_UNLIKELY(!(is_null() || is_array())))
{
detail::throw_cannot_use_with(detail::exception_id::push_back_wrong_type, "push_back()", *this);
}
// transform a null object into an array
if (is_null())
{
convert_null_to<array_t>();
}
// add the element to the array
const auto old_capacity = container_capacity();
m_data.m_value.array->push_back(val);
set_parent_after_insert(m_data.m_value.array->back(), old_capacity);
push_back_array_impl(val);
}
/// @brief add an object to an array