// 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)

1. Compares whether one JSON value lhs is less than or equal to another JSON value rhs 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 !(rhs < lhs) (see operator<).

2. Compares whether a JSON value is less than or equal to a scalar or a scalar is less than or equal to a JSON value by converting the scalar to a JSON value and comparing both JSON values according to 1.

ScalarType : a scalar type according to std::is_scalar<ScalarType>::value

lhs (in) : first value to consider

rhs (in) : second value to consider

whether lhs is less than or equal to rhs

No-throw guarantee: this function never throws exceptions.

Linear.

!!! 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).

??? example

The example demonstrates comparing several JSON types.
    
```cpp
--8<-- "examples/operator__lessequal.cpp"
```

Output:

```json
--8<-- "examples/operator__lessequal.output"
```

• operator<=> comparison: 3-way

1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.