pub trait Conv<T>: Sized {
// Required method
fn try_conv(v: T) -> Result<Self, Error>;
// Provided method
fn conv(v: T) -> Self { ... }
}Expand description
Like From, but supports fallible conversions
This trait is intented to be an extension over From, also supporting
fallible conversions of numeric types.
Since Rust does not yet have stable support for handling conflicting
implementations (specialization or otherwise), only conversions between
the most important numeric types are supported for now.
The sister-trait Cast supports “into” style usage.
Required Methods§
Provided Methods§
fn conv(v: T) -> Self
fn conv(v: T) -> Self
Convert from T to Self
This method must return the same result as Self::try_conv where that
method succeeds, but differs in the handling of errors:
- In debug builds the method panics on error
- Otherwise, the method may panic or may return a different value,
but like with the
askeyword all results must be well-defined and safe.
Default implementations use Self::try_conv and panic on error.
Implementations provided by this library will panic in debug builds
or if the always_assert feature flag is used, and otherwise will
behave identically to the as keyword.
This mirrors the behaviour of Rust’s overflow checks on integer arithmetic in that it is a tool for diagnosing logic errors where success is expected.