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Write the negated enable_if conditions of json_view with negation<>

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With a ! or && in the condition, astyle spaces the whole template
header (template < ... >); detail::negation and a named trait keep it
compact, as the library writes such conditions elsewhere. From gregmarr's
review of #5630.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann committed 2026-10-20 08:49:02 +02:00
1 parent 379032ae20
commit a7cd43cc34
2 files changed
+8 -3
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include/nlohmann/detail/view/value.hpp
+5
View File
@@ -104,6 +104,11 @@ Map map_value(const View& v)
template<typename Key>
struct is_string_key : std::is_constructible<Key, const char*, std::size_t> {};
/// the arithmetic types arithmetic_value() converts to (bool has its own
/// conversion)
template<typename T>
struct is_non_bool_arithmetic : conjunction<std::is_arithmetic<T>, negation<std::is_same<T, bool>>> {};
/// whether View::get<T>() converts to T without materialize(); get_to()
/// assigns these, and passes the others to from_json
template<typename T, typename BasicJsonType, typename View>
include/nlohmann/json_view.hpp
+3 -3
View File
@@ -365,7 +365,7 @@ class basic_json_view
/// the member with this key converted to T, or the default value if there
/// is no such member (the first one, should the key occur more than
/// once). Throws type_error.306 if this is not an object.
template < typename T, typename std::enable_if < !std::is_same<typename std::decay<T>::type, const char*>::value, int >::type = 0 >
template<typename T, typename std::enable_if<detail::negation<std::is_same<typename std::decay<T>::type, const char*>>::value, int>::type = 0>
T value(string_view_t key, const T& default_value) const
{
if (NLOHMANN_VIEW_UNLIKELY(!is_object()))
@@ -384,7 +384,7 @@ class basic_json_view
/// the value a JSON pointer refers to converted to T, or the default
/// value if the pointer cannot be resolved. Throws type_error.306 if this
/// is neither an object nor an array.
template < typename T, typename std::enable_if < !std::is_same<typename std::decay<T>::type, const char*>::value, int >::type = 0 >
template<typename T, typename std::enable_if<detail::negation<std::is_same<typename std::decay<T>::type, const char*>>::value, int>::type = 0>
T value(const json_pointer& ptr, const T& default_value) const
{
if (NLOHMANN_VIEW_UNLIKELY(!is_structured()))
@@ -627,7 +627,7 @@ class basic_json_view
return (m_node->flags & detail::view::node_flags::is_true) != 0;
}
template < typename T, typename std::enable_if < std::is_arithmetic<T>::value && !std::is_same<T, bool>::value, int >::type = 0 >
template<typename T, typename std::enable_if<detail::view::is_non_bool_arithmetic<T>::value, int>::type = 0>
NLOHMANN_VIEW_ALWAYS_INLINE T get_impl(detail::view::value_tag<T> /*unused*/, detail::priority_tag<2> /*unused*/) const
{
if (NLOHMANN_VIEW_UNLIKELY(m_node == nullptr))