从连续容器创建新的可修改 buffer。
template< typename T> mutable_buffer buffer( T & data, std::size_t max_size_in_bytes, constraint_t< is_contiguous_iterator< typename T::iterator >::value, defaulted_constraint > = defaulted_constraint(), constraint_t< !is_convertible< T, const_buffer >::value, defaulted_constraint > = defaulted_constraint(), constraint_t< !is_convertible< T, mutable_buffer >::value, defaulted_constraint > = defaulted_constraint(), constraint_t< !is_const< remove_reference_t< typename std::iterator_traits< typename T::iterator >::reference > >::value, defaulted_constraint > = defaulted_constraint());
一个等价于 mutable_buffer
的值
mutable_buffer( data.size() ? &data[0] : 0, min( data.size() * sizeof(typename T::value_type), max_size_in_bytes));