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api/basic_json/operator_ne.md
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@@ -19,10 +19,8 @@ class basic_json {
};
```
1. Compares two JSON values for inequality according to the following rules:
- The comparison always yields `#!cpp false` if (1) either operand is discarded, or (2) either operand is `NaN` and
the other operand is either `NaN` or any other number.
- Otherwise, returns the result of `#!cpp !(lhs == rhs)` (until C++20) or `#!cpp !(*this == rhs)` (since C++20).
1. Compares two JSON values for inequality. Returns `#!cpp !(lhs == rhs)` (until C++20) or `#!cpp !(*this == rhs)` (since C++20).
- This means the comparison is simply the logical negation of `operator==`, including for special values like `NaN` and `discarded`.
2. Compares a JSON value and a scalar or a scalar and a JSON value for inequality by converting the scalar to a JSON
value and comparing both JSON values according to 1.
@@ -54,13 +52,12 @@ Linear.
## Notes
!!! note "Comparing `NaN`"
!!! note "Comparing `NaN` and `discarded`"
`NaN` values are unordered within the domain of numbers.
The following comparisons all yield `#!cpp false`:
1. Comparing a `NaN` with itself.
2. Comparing a `NaN` with another `NaN`.
3. Comparing a `NaN` and any other number.
Since `operator!=` is defined as `!(a == b)`, the behavior for special values follows that of `operator==`:
- For `NaN` values: `NaN == NaN` yields `#!cpp false`, so `NaN != NaN` yields `#!cpp true`.
- For `discarded` values: `discarded == x` yields `#!cpp false` for any `x`, so `discarded != x` yields `#!cpp true`.
## Examples
@@ -94,5 +91,7 @@ Linear.
## Version history
1. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
2. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
1. Added in version 1.0.0. Added C++20 member functions in version 3.11.0. Changed in version 3.13.0 to remove
special-casing for `NaN` and `discarded` values; `operator!=` now consistently means `!(a == b)`.
2. Added in version 1.0.0. Added C++20 member functions in version 3.11.0. Changed in version 3.13.0 to remove
special-casing for `NaN` and `discarded` values; `operator!=` now consistently means `!(a == b)`.