Struct Probe

pub struct Probe { /* private fields */ }

A probe object, which is used for probing for features.

Create this with ProbeProbeo::new, and then probe with one of the probing methods.

Implementations

impl Probe

pub fn new() -> Self

Creates a new Probe object with a default configuration.

In particular, it consults the environment variable "RUSTC" to determine what Rust compiler to use, and the environment variable "OUT_DIR" to determine where to put object files. If these are not set, they default to the values "rustc" and "target", respectively.

Panics

If the child rustc cannot be started or communicated with.

Examples

use feature_probe::Probe;

let probe = Probe::new();
assert!( probe.probe_type("u32") );

pub fn probe_type(&self, type_name: &str) -> bool

Probes for the existence of the given type by name.

Panics

If the child rustc cannot be started or communicated with.

Examples

use feature_probe::Probe;

let probe = Probe::new();
assert!(   probe.probe_type("u32") );
assert!( ! probe.probe_type("u512") );

pub fn probe_expression(&self, expression: &str) -> bool

Probes whether the given expression can be compiled.

Examples

use feature_probe::Probe;

let probe = Probe::new();
assert!(   probe.probe_expression("3 + 4") );
assert!( ! probe.probe_expression("3 + true") );

pub fn probe(&self, code: &str) -> bool

Probes for whether a whole program can be compiled.

Panics

If the child rustc cannot be started or communicated with.

Examples

use feature_probe::Probe;

let probe = Probe::new();
assert!(   probe.probe("fn main() { }") );
assert!( ! probe.probe("fn main(args: Vec<String>) { }") );

pub fn probe_result(&self, code: &str) -> Result<bool>

Probes for whether a whole program can be compiled.

Examples

use feature_probe::Probe;

let probe = Probe::new();
assert_eq!( probe.probe_result("fn main() { }").unwrap(),                  true );
assert_eq!( probe.probe_result("fn main(args: Vec<String>) { }").unwrap(), false );

Trait Implementations

impl Debug for Probe

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

Formats the value using the given formatter.

impl Default for Probe

fn default() -> Self

Returns the “default value” for a type.