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nlohmann
2026-10-03 07:03:52 +00:00
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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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@@ -5,10 +5,10 @@
bool operator!=(const_reference lhs, const_reference rhs) noexcept; // (1)
template<typename ScalarType>
bool operator!=(const_reference lhs, const ScalarType rhs) noexcept; // (2)
bool operator!=(const_reference lhs, const ScalarType rhs) noexcept(/* see below */); // (2)
template<typename ScalarType>
bool operator!=(ScalarType lhs, const const_reference rhs) noexcept; // (2)
bool operator!=(ScalarType lhs, const const_reference rhs) noexcept(/* see below */); // (2)
```
1. Compares two JSON values for inequality. Returns `!(lhs == rhs)`.
@@ -33,7 +33,8 @@ whether the values `lhs`/`*this` and `rhs` are not equal
## Exception safety
No-throw guarantee: this function never throws exceptions.
1. No-throw guarantee: this function never throws exceptions.
1. No-throw guarantee if converting the scalar to a JSON value cannot throw, as for numbers, Booleans, and `nullptr`; the function is `noexcept` exactly in that case. Otherwise, it throws what the conversion throws, for example `std::bad_alloc` when converting a string, or [`out_of_range.410`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range410) for an enum value not mapped by [`NLOHMANN_JSON_SERIALIZE_ENUM_STRICT`](https://json.nlohmann.me/api/macros/nlohmann_json_serialize_enum_strict/index.md).
## Complexity
@@ -141,4 +142,4 @@ null != nullptr false
## Version history
1. Added in version 1.0.0. Added a C++20 member function in version 3.11.0. Changed in version 3.13.0 unreleased to remove special-casing for `NaN` and `discarded` values; `operator!=` now consistently means `!(a == b)`. Removed the C++20 member function in version 3.13.0 unreleased; since C++20, the compiler rewrites `a != b` using `operator==`.
1. Added in version 1.0.0. Changed in version 3.13.0 unreleased to remove special-casing for `NaN` and `discarded` values; `operator!=` now consistently means `!(a == b)`. Since C++20, the compiler rewrites `a != b` using `operator==`.
1. Added in version 1.0.0. Changed in version 3.13.0 unreleased to remove special-casing for `NaN` and `discarded` values; `operator!=` now consistently means `!(a == b)`. Since C++20, the compiler rewrites `a != b` using `operator==`. Made conditionally `noexcept` in version 3.13.0 unreleased; before, a throwing conversion called `std::terminate`.