Trait coap_message::MessageOption [−][src]
Iteration item for option values
An implementation needs to allow the user to get the value as a memory slice. This is trivial
for messages that are stored in serialized form. Implementations that store options
semantically (eg. as a struct Block { n: usize, m: bool, szx: u8 }
) will typically make their
MessageOption large enough to contain serialized options, or heap-allocate for them.
Required methods
fn number(&self) -> u16
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Numeric option number
See [OptionNumber] on how to interpret them.
fn value(&self) -> &[u8]
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Obtain the option's raw value
This can be used directly for options with opaque value semantics; for other semantics, see the value_str and value_uint helper methods.
Provided methods
fn value_str(&self) -> Option<&str>
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Obtain the option's value as a text string, or None if the option contains invalid UTF-8.
Implementations can override this to reduce the string checking overhead if they already have the value as a string internally.
fn value_uint<U: Ux>(&self) -> Option<U>
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Obtain the option's value as a number following the uint
value
format, or None if the option is too
long.
Implementations can override this to reduce conversion overhead if they already have a numeric value internally as soon as U's type is replaced with an equally capable public num trait.