value::get_int64

## `value::get_int64`

Return the underlying `std::int64_t`, without checking.

### Synopsis

    std::int64_t&
    get_int64() noexcept; (1)

    std::int64_t
    get_int64() const noexcept; (2)

### Description

This is the fastest way to access the underlying representation when the kind is known in advance.

### Preconditions

    this->is_int64()

### Complexity

Constant.

### Exception Safety

No-throw guarantee.

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