#[repr(C)]
pub struct Counter { pub kind: CounterKind, id: u32, }
Expand description

A reference to an instance of an abstract “counter” that will yield a value in a coverage report. Note that id has different interpretations, depending on the kind:

  • For CounterKind::Zero, id is assumed to be 0
  • For CounterKind::CounterValueReference, id matches the counter_id of the injected instrumentation counter (the index argument to the LLVM intrinsic instrprof.increment())
  • For CounterKind::Expression, id is the index into the coverage map’s array of counter expressions. Aligns with llvm::coverage::Counter Important: The Rust struct layout (order and types of fields) must match its C++ counterpart.

Fields

kind: CounterKindid: u32

Implementations

Constructs a new Counter of kind Zero. For this CounterKind, the id is not used.

Constructs a new Counter of kind CounterValueReference, and converts the given 1-based counter_id to the required 0-based equivalent for the Counter encoding.

Constructs a new Counter of kind Expression.

Returns true if the Counter kind is Zero.

An explicitly-named function to get the ID value, making it more obvious that the stored value is now 0-based.

Trait Implementations

Returns a copy of the value. Read more
Performs copy-assignment from source. 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.

The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. 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.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes