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[rust] Add FlatBufferBuilder::force_defaults API (#5946)

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* [rust] Add force_defaults method FlatBufferBuilder

This works just like the same method already available in other
languages.

* Add binary format test for force_defaults
This commit is contained in:
Matt Brubeck
2020-06-08 09:47:36 -07:00
committed by GitHub
parent 17c1f35fa0
commit 53fb453e04
2 changed files with 35 additions and 3 deletions
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19
rust/flatbuffers/src/builder.rs
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@@ -52,6 +52,7 @@ pub struct FlatBufferBuilder<'fbb> {
finished: bool,
min_align: usize,
force_defaults: bool,
_phantom: PhantomData<&'fbb ()>,
}
@@ -85,6 +86,7 @@ impl<'fbb> FlatBufferBuilder<'fbb> {
finished: false,
min_align: 0,
force_defaults: false,
_phantom: PhantomData,
}
@@ -148,10 +150,9 @@ impl<'fbb> FlatBufferBuilder<'fbb> {
#[inline]
pub fn push_slot<X: Push + PartialEq>(&mut self, slotoff: VOffsetT, x: X, default: X) {
self.assert_nested("push_slot");
if x == default {
return;
if x != default || self.force_defaults {
self.push_slot_always(slotoff, x);
}
self.push_slot_always(slotoff, x);
}
/// Push a Push'able value onto the front of the in-progress data, and
@@ -327,6 +328,18 @@ impl<'fbb> FlatBufferBuilder<'fbb> {
WIPOffset::new(self.push::<UOffsetT>(items.len() as UOffsetT).value())
}
/// Set whether default values are stored.
///
/// In order to save space, fields that are set to their default value
/// aren't stored in the buffer. Setting `force_defaults` to `true`
/// disables this optimization.
///
/// By default, `force_defaults` is `false`.
#[inline]
pub fn force_defaults(&mut self, force_defaults: bool) {
self.force_defaults = force_defaults;
}
/// Get the byte slice for the data that has been written, regardless of
/// whether it has been finished.
#[inline]