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The type of container used for the body.
using value_type = span< T >;
| Name | Description | 
|---|---|
| The const iterator used by the container. | |
| The const pointer used by the container. | |
| The const reference used by the container. | |
| The type of value, including cv qualifiers. | |
| The type of integer used to index the span. | |
| The iterator used by the container. | |
| A pointer to a span element. | |
| A reference to a span element. | |
| The type of value of each span element. | 
| Name | Description | 
|---|---|
| Returns an iterator to the beginning of the span. | |
| Returns an iterator to the beginning of the span. | |
| Returns an iterator to one past the end of the span. | |
| Returns a pointer to the beginning of the span. | |
| 
                    Returns  | |
| Returns an iterator to one past the end of the span. | |
| Assignment. | |
| Returns the number of elements in the span. | |
| Constructor. | 
This class implements a non-owning reference to a storage area of a certain size and having an underlying integral type with size of 1.
| Type | Description | 
|---|---|
| 
                     | The type pointed to by span iterators | 
          This determines the type of message::body when this body type is used
          with a message container.