mirror of
https://github.com/NixOS/nix
synced 2024-09-20 11:11:03 -04:00
fecff520d7
Previously, `state.mkList()` would set the type of the value to tList
and allocate the list vector, but it would not initialize the values
in the list. This has two problems:
* If an exception occurs, the list is left in an undefined state.
* More importantly, for multithreaded evaluation, if a value
transitions from thunk to non-thunk, it should be final (i.e. other
threads should be able to access the value safely).
To address this, there now is a `ListBuilder` class (analogous to
`BindingsBuilder`) to build the list vector prior to the call to
`Value::mkList()`. Typical usage:
auto list = state.buildList(size);
for (auto & v : list)
v = ... set value ...;
vRes.mkList(list);
|
||
|---|---|---|
| .. | ||
| flake | ||
| value | ||
| derived-path.cc | ||
| error_traces.cc | ||
| eval.cc | ||
| json.cc | ||
| local.mk | ||
| primops.cc | ||
| search-path.cc | ||
| trivial.cc | ||