Struct Preconditions 

#[non_exhaustive]
pub struct Preconditions {
    pub if_match: Vec<EtagMatcher>,
    pub if_none_match: Vec<EtagMatcher>,
}

Protocol-neutral write preconditions.

Use Preconditions::none to skip all checks. Multiple matchers within a list are OR’d; the two lists are AND’d.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

if_match: Vec<EtagMatcher>

If-Match-style matchers. The write proceeds only if any matcher matches the current ETag.

if_none_match: Vec<EtagMatcher>

If-None-Match-style matchers. The write proceeds only if no matcher matches the current ETag.

Implementations

impl Preconditions

pub fn new(if_match: Vec<EtagMatcher>, if_none_match: Vec<EtagMatcher>) -> Self

Builds protocol-neutral write preconditions from matcher lists.

pub fn none() -> Self

Returns a Preconditions value with both lists empty (no checks).