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##### results::begin

Returns an iterator pointing to the first resultset that this object contains.

###### Synopsis

    results::iterator
    begin() const noexcept;

###### Preconditions

`this->has_value() == true`

###### Exception safety

No-throw guarantee.

###### Object lifetimes

The returned iterator and any reference obtained from it are valid as long as `*this` is alive. Move operations invalidate iterators.

###### Complexity

Constant.