Std::any::operator= (3) Linux Manual Page

std::any::operator= – std::any::operator=

Synopsis

any &operator=(const any &rhs);
(1)(since C++ 17)

    any &
    operator=(any &&rhs) noexcept;
(2)(since C++ 17)

    template <typename ValueType>
    (3)(since C++ 17)

        any &
        operator=(ValueType &&rhs);

Assigns contents to the contained value.
1) Assigns by copying the state of rhs, as if by any(rhs).swap(*this).
2) Assigns by moving the state of rhs, as if by any(std::move(rhs)).swap(*this). rhs is left in a valid but unspecified state after the assignment.
3) Assigns the type and value of rhs, as if by any(std::forward<ValueType>(rhs)).swap(*this). This overload only participates in overload resolution if std::decay_t<ValueType> is not the same type as any and std::is_copy_constructible_v<std::decay_t<ValueType>> is true. .

Template parameters

ValueType – contained value type

Type requirements

–
std::decay_t<ValueType> must meet the requirements of CopyConstructible.

Parameters

rhs – object whose contained value to assign

Return value

*this

Exceptions

1,3) Throws bad_alloc or any exception thrown by the constructor of the contained type. If an exception is thrown, there are no effects (strong exception guarantee).

std::any::operator= (3) Linux Manual Page