array::operator=

## `array::operator=`

Assignment operators.

### Synopsis

    array&
    operator=(
        array const& other); (1)

    array&
    operator=(
        array&& other); (2)

    array&
    operator=(
        std::initializer_list< value_ref > init); (3)

### Description

Replaces the contents of the array.

- (1) the contents are replaced with an element-wise copy of `other`.

- (2) takes ownership of `other`'s element storage if `*storage() == *other.storage()`; otherwise equivalent to (1).

- (3) the contents are replaced with a copy of the values in `init`.

After (2), the moved-from array behaves as if newly constructed with its current storage pointer.

### Complexity

- (1) linear in `size() + other.size()`.

- (2) constant if `*storage() == *other.storage()`; otherwise linear in `size() + other.size()`.

- (1) linear in `size() + init.size()`.

### Exception Safety

(2) provides strong guarantee if `*storage() != *other.storage()` and no-throw guarantee otherwise. Other overloads provide strong guarantee. Calls to `memory_resource::allocate` may throw.

### Return Value

`*this`

### Parameters

Name | Description
--- | ---
`other` | The array to copy.
`init` | The initializer list to copy.

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