nlohmann::basic_json::operator=

basic_json& operator=(basic_json other) noexcept (
    std::is_nothrow_move_constructible<value_t>::value &&
    std::is_nothrow_move_assignable<value_t>::value &&
    std::is_nothrow_move_constructible<json_value>::value &&
    std::is_nothrow_move_assignable<json_value>::value &&
    std::is_nothrow_move_assignable<json_base_class_t>::value
);

Copy assignment operator. Copies a JSON value via the "copy and swap" strategy: It is expressed in terms of the copy constructor, destructor, and the swap() member function.

Parameters

other (in): value to copy from

Exception safety

Strong guarantee: if an exception is thrown while copying other, there are no changes to #!cpp *this.

Complexity

Linear.

Examples

??? example

The code below shows and example for the copy assignment. It creates a copy of value `a` which is then swapped with
`b`. Finally, the copy of `a` (which is the null value after the swap) is destroyed.
 
```cpp
#include <iostream>
#include <nlohmann/json.hpp>

using json = nlohmann::json;

int main()
{
    // create JSON values
    json a = 23;
    json b = 42;

    // copy-assign a to b
    b = a;

    // serialize the JSON arrays
    std::cout << a << '\n';
    std::cout << b << '\n';
}

```

Output:

```json
23
23

```

Version history

Added in version 1.0.0.

1.6 KiB Raw Blame History