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Drop the null_result parameter JSON_IMPLEMENT_OPERATOR no longer uses (#6005)

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Without the same-type scalar cases, the macro body has no use for it, and
JSON_IMPLEMENT_SCALAR_CASES is now used only by JSON_IMPLEMENT_SCALAR_FAST.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Niels Lohmann authored and GitHub committed 2026-11-02 17:54:39 +01:00
1 parent 5c4f585ac2
commit 596028c460
2 files changed
+8 -12
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include/nlohmann/json.hpp
+4 -6
View File
@@ -5388,8 +5388,7 @@ public:
/// @name lexicographical comparison operators
/// @{
// the same-type cases for non-owning scalars, shared by JSON_IMPLEMENT_OPERATOR
// and JSON_IMPLEMENT_SCALAR_FAST
// the same-type cases for non-owning scalars, used by JSON_IMPLEMENT_SCALAR_FAST
#define JSON_IMPLEMENT_SCALAR_CASES(op, null_result) \
case value_t::null: \
return (null_result); \
@@ -5411,7 +5410,7 @@ public:
// because any negative signed value is smaller than any unsigned value.
// Otherwise, the non-negative signed value is cast to unsigned before the
// comparison to avoid wraparound.
#define JSON_IMPLEMENT_OPERATOR(op, null_result, unordered_result, default_result, deep_result, may_descend) \
#define JSON_IMPLEMENT_OPERATOR(op, unordered_result, default_result, deep_result, may_descend) \
const auto lhs_type = lhs.type(); \
const auto rhs_type = rhs.type(); \
\
@@ -5548,7 +5547,7 @@ public:
JSON_HEDLEY_DIAGNOSTIC_PUSH
JSON_HEDLEY_PRAGMA(GCC diagnostic ignored "-Wfloat-equal")
#endif
JSON_IMPLEMENT_OPERATOR( ==, true, false, false,
JSON_IMPLEMENT_OPERATOR( ==, false, false,
compare_iteratively<false>(lhs, rhs, false) == compare_result::equal, true)
#ifdef __GNUC__
JSON_HEDLEY_DIAGNOSTIC_POP
@@ -5562,7 +5561,6 @@ public:
// default_result is used if we cannot compare values. In that case,
// we compare types.
JSON_IMPLEMENT_OPERATOR(<=>, // *NOPAD*
std::partial_ordering::equivalent,
std::partial_ordering::unordered,
lhs_type <=> rhs_type, // *NOPAD*
to_partial_ordering(compare_iteratively<true>(lhs, rhs, false)), true)
@@ -5574,7 +5572,7 @@ public:
// default_result is used if we cannot compare values. In that case,
// we compare types. Note we have to call the operator explicitly,
// because MSVC has problems otherwise.
JSON_IMPLEMENT_OPERATOR( <, false, false, operator<(lhs_type, rhs_type),
JSON_IMPLEMENT_OPERATOR( <, false, operator<(lhs_type, rhs_type),
compare_iteratively<true>(lhs, rhs, true) == compare_result::less, false)
}
#endif