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2.2.2: share swap() overloads via swap_impl (#5891)

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Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Niels Lohmann committed 2026-10-23 10:29:16 +02:00
1 parent 8b19b94fd6
commit 3a4285ad88
1 file changed
+28 -52
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include/nlohmann/json.hpp
+28 -52
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@@ -3052,6 +3052,27 @@ public:
detail::throw_literal<invalid_iterator>(detail::exception_id::iterator_from_other_value, "iterator does not fit current value", obj);
}
/// @throw type_error.310 always, as swap() with the given operand is not defined for the type of @a j
JSON_HEDLEY_NO_RETURN JSON_HEDLEY_NEVER_INLINE
static void throw_swap_wrong_type(const char* operation, const basic_json& j)
{
detail::throw_cannot_use_with(detail::exception_id::swap_wrong_type, operation, j);
}
/// exchange the stored @a Stored value (if the value has that type) with @a other
template<typename Stored, typename Other>
void swap_impl(Other& other, const char* operation)
{
Stored* const stored = get_impl_ptr(static_cast<Stored*>(nullptr));
if (JSON_HEDLEY_UNLIKELY(stored == nullptr))
{
throw_swap_wrong_type(operation, *this);
}
using std::swap;
swap(*stored, other);
}
/// @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)
@@ -5248,82 +5269,37 @@ public:
/// @sa https://json.nlohmann.me/api/basic_json/swap/
void swap(array_t& other) // NOLINT(bugprone-exception-escape,cppcoreguidelines-noexcept-swap,performance-noexcept-swap)
{
// swap only works for arrays
if (JSON_HEDLEY_LIKELY(is_array()))
{
using std::swap;
swap(*(m_data.m_value.array), other);
set_parents();
}
else
{
detail::throw_cannot_use_with(detail::exception_id::swap_wrong_type, "swap(array_t&)", *this);
}
swap_impl<array_t>(other, "swap(array_t&)");
set_parents();
}
/// @brief exchanges the values
/// @sa https://json.nlohmann.me/api/basic_json/swap/
void swap(object_t& other) // NOLINT(bugprone-exception-escape,cppcoreguidelines-noexcept-swap,performance-noexcept-swap)
{
// swap only works for objects
if (JSON_HEDLEY_LIKELY(is_object()))
{
using std::swap;
swap(*(m_data.m_value.object), other);
set_parents();
}
else
{
detail::throw_cannot_use_with(detail::exception_id::swap_wrong_type, "swap(object_t&)", *this);
}
swap_impl<object_t>(other, "swap(object_t&)");
set_parents();
}
/// @brief exchanges the values
/// @sa https://json.nlohmann.me/api/basic_json/swap/
void swap(string_t& other) // NOLINT(bugprone-exception-escape,cppcoreguidelines-noexcept-swap,performance-noexcept-swap)
{
// swap only works for strings
if (JSON_HEDLEY_LIKELY(is_string()))
{
using std::swap;
swap(*(m_data.m_value.string), other);
}
else
{
detail::throw_cannot_use_with(detail::exception_id::swap_wrong_type, "swap(string_t&)", *this);
}
swap_impl<string_t>(other, "swap(string_t&)");
}
/// @brief exchanges the values
/// @sa https://json.nlohmann.me/api/basic_json/swap/
void swap(binary_t& other) // NOLINT(bugprone-exception-escape,cppcoreguidelines-noexcept-swap,performance-noexcept-swap)
{
// swap only works for binary values
if (JSON_HEDLEY_LIKELY(is_binary()))
{
using std::swap;
swap(*(m_data.m_value.binary), other);
}
else
{
detail::throw_cannot_use_with(detail::exception_id::swap_wrong_type, "swap(binary_t&)", *this);
}
swap_impl<binary_t>(other, "swap(binary_t&)");
}
/// @brief exchanges the values
/// @sa https://json.nlohmann.me/api/basic_json/swap/
void swap(typename binary_t::container_type& other) // NOLINT(bugprone-exception-escape)
{
// swap only works for binary values
if (JSON_HEDLEY_LIKELY(is_binary()))
{
using std::swap;
swap(*(m_data.m_value.binary), other);
}
else
{
detail::throw_cannot_use_with(detail::exception_id::swap_wrong_type, "swap(binary_t::container_type&)", *this);
}
swap_impl<binary_t>(other, "swap(binary_t::container_type&)");
}
/// @}