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2.2 KiB
2.2 KiB
nlohmann::basic_json::operator>
// until C++20
bool operator>(const_reference lhs, const_reference rhs) noexcept; // (1)
template<typename ScalarType>
bool operator>(const_reference lhs, const ScalarType rhs) noexcept; // (2)
template<typename ScalarType>
bool operator>(ScalarType lhs, const const_reference rhs) noexcept; // (2)
-
Compares whether one JSON value
lhsis greater than another JSON valuerhsaccording to the following rules:- The comparison always yields
#!cpp falseif (1) either operand is discarded, or (2) either operand isNaNand the other operand is eitherNaNor any other number. - Otherwise, returns the result of
#!cpp !(lhs <= rhs)(see operator<=).
- The comparison always yields
-
Compares wether a JSON value is greater than a scalar or a scalar is greater than a JSON value by converting the scalar to a JSON value and comparing both JSON values according to 1.
Template parameters
ScalarType- a scalar type according to
std::is_scalar<ScalarType>::value
Parameters
lhs(in)- first value to consider
rhs(in)- second value to consider
Return value
whether lhs is greater than rhs
Exception safety
No-throw guarantee: this function never throws exceptions.
Complexity
Linear.
Notes
!!! note "Comparing NaN"
`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.
!!! note "Operator overload resolution"
Since C++20 overload resolution will consider the _rewritten candidate_ generated from
[`operator<=>`](operator_spaceship.md).
Examples
??? example
The example demonstrates comparing several JSON types.
```cpp
--8<-- "examples/operator__greater.cpp"
```
Output:
```json
--8<-- "examples/operator__greater.output"
```
See also
- operator<=> comparison: 3-way
Version history
- Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
- Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.