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api/basic_json/operator_ne/index.html
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api/basic_json/operator_ne/index.md
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@@ -19,10 +19,9 @@ class basic_json {
};
```
1. Compares two JSON values for inequality according to the following rules:
1. Compares two JSON values for inequality. Returns `!(lhs == rhs)` (until C++20) or `!(*this == rhs)` (since C++20).
- The comparison always yields `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 `!(lhs == rhs)` (until C++20) or `!(*this == rhs)` (since C++20).
- This means the comparison is simply the logical negation of `operator==`, including for special values like `NaN` and `discarded`.
1. 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.
@@ -50,13 +49,12 @@ Linear.
## Notes
Comparing `NaN`
Comparing `NaN` and `discarded`
`NaN` values are unordered within the domain of numbers. The following comparisons all yield `false`:
Since `operator!=` is defined as `!(a == b)`, the behavior for special values follows that of `operator==`:
1. Comparing a `NaN` with itself.
1. Comparing a `NaN` with another `NaN`.
1. Comparing a `NaN` and any other number.
- For `NaN` values: `NaN == NaN` yields `false`, so `NaN != NaN` yields `true`.
- For `discarded` values: `discarded == x` yields `false` for any `x`, so `discarded != x` yields `true`.
## Examples
@@ -141,5 +139,5 @@ null != nullptr false
## Version history
1. 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.
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)`.
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)`.