Struct SafeLocale 

pub struct SafeLocale { /* private fields */ }

RAII guard temporarily switching the numeric locale to "C" (igraph_enter_safelocale / igraph_exit_safelocale).

igraph’s readers and writers need a locale with a decimal point. While the guard is alive the "C" numeric locale is in effect for the current thread (on platforms without per-thread locales igraph falls back to the process-wide setlocale, which is not thread safe); dropping it restores the previous locale. Rust programs start in the "C" locale, so this is only needed when some other code changed it.

The guard is neither Send nor Sync: it must be dropped on the thread that created it. Nested guards restore their locales correctly when dropped in reverse order of creation (as scopes do).

Binds igraph_enter_safelocale and igraph_exit_safelocale.

use igraph::{foreign::SafeLocale, prelude::*};
let g = Graph::from_edges(&[(0, 1)], 2, true).unwrap();
let text = {
    let _locale = SafeLocale::enter().unwrap();
    g.write_graph_dimacs_flow_to_string(0, 1, &[0.5]).unwrap()
}; // previous locale restored here
assert!(text.ends_with("a 1 2 0.5\n"));

Implementations

impl SafeLocale

pub fn enter() -> Result<Self>

Switches the current thread to the "C" numeric locale until the returned guard is dropped.

Errors

ErrorKind::Failure if the "C" locale can’t be created.

Trait Implementations

impl Debug for SafeLocale

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Drop for SafeLocale

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.