Buffer-oriented synchronous write stream requirements

A type X meets the SyncWriteStream requirements if it satisfies the requirements listed below.

In the table below, a denotes a value of type X , cb denotes a (possibly const) value satisfying the ConstBufferSequence requirements, and ec denotes an object of type error_code .

Table 33. SyncWriteStream requirements

operation	type	semantics, pre/post-conditions
`a . write_some ( cb )` `a . write_some ( cb , ec )`	`size_t`	Meets the requirements for a write operation . If `buffer_size ( cb ) > 0` , writes one or more bytes of data to the stream `a` from the buffer sequence `cb` . If successful, sets `ec` such that `! ec` is `true` , and returns the number of bytes written. If an error occurred, sets `ec` such that `!! ec` is `true` , and returns 0. If `buffer_size ( cb ) == 0` , the operation shall not block. Sets `ec` such that `! ec` is `true` , and returns 0.

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Buffer-oriented synchronous write stream requirements