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Diffstat (limited to 'vendor/scopeguard/examples/readme.rs')
-rw-r--r-- | vendor/scopeguard/examples/readme.rs | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/vendor/scopeguard/examples/readme.rs b/vendor/scopeguard/examples/readme.rs new file mode 100644 index 000000000..0710f9f5a --- /dev/null +++ b/vendor/scopeguard/examples/readme.rs @@ -0,0 +1,27 @@ + +#[macro_use(defer)] extern crate scopeguard; + +use scopeguard::guard; + +fn f() { + defer!(println!("Called at return or panic")); + panic!(); +} + +use std::fs::File; +use std::io::Write; + +fn g() { + let f = File::create("newfile.txt").unwrap(); + let mut file = guard(f, |f| { + // write file at return or panic + let _ = f.sync_all(); + }); + // Access the file through the scope guard itself + file.write_all(b"test me\n").unwrap(); +} + +fn main() { + f(); + g(); +} |