Struct failure::Backtrace

source ·
pub struct Backtrace { /* private fields */ }
Expand description

A Backtrace.

This is an opaque wrapper around the backtrace provided by libbacktrace. A variety of optimizations have been performed to avoid unnecessary or ill-advised work:

  • If this crate is compiled in no_std compatible mode, Backtrace is an empty struct, and will be completely compiled away.
  • If this crate is run without the RUST_BACKTRACE environmental variable enabled, the backtrace will not be generated at runtime.
  • Even if a backtrace is generated, the most expensive part of generating a backtrace is symbol resolution. This backtrace does not perform symbol resolution until it is actually read (e.g. by printing it). If the Backtrace is never used for anything, symbols never get resolved.

Even with these optimizations, including a backtrace in your failure may not be appropriate to your use case. You are not required to put a backtrace in a custom Fail type.

Implementations

Constructs a new backtrace. This will only create a real backtrace if the crate is compiled in std mode and the RUST_BACKTRACE environmental variable is activated.

Trait Implementations

Formats the value using the given formatter. Read more
Returns the “default value” for a type. Read more
Formats the value using the given formatter. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Converts the given value to a String. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.