Enum Builtin 

pub enum Builtin {
    File,
    FileName,
    BaseFile,
    Line,
    IncludeLevel,
    Counter,
}

A predefined macro whose value is a question rather than a replacement list.

__FILE__ and its relatives cannot be written as a body, because what they stand for depends on where they are used rather than on what the target is. GCC calls these builtin macros and answers them while expanding, and this is the same arrangement: the table holds the name and which question it is, and crate::expand asks the source map when it meets one. Everything else about them is ordinary, so #ifdef __FILE__ is true, #undef __FILE__ works, and redefining one warns the way redefining anything else does.

Variants

File

__FILE__, the file the use is in, spelled as a string literal.

FileName

__FILE_NAME__, the same file with the directories taken off.

BaseFile

__BASE_FILE__, the file at the bottom of the include stack.

Line

__LINE__, the line the use is on.

IncludeLevel

__INCLUDE_LEVEL__, how many #include directives deep the use is.

Counter

__COUNTER__, a number that is different every time it is expanded.

Implementations

impl Builtin

pub const ALL: [(&'static str, Builtin); 6]

Every builtin macro and its spelling.

One list, so that the set the preprocessor defines and the set -dM prints cannot drift apart.

Trait Implementations

impl Clone for Builtin

fn clone(&self) -> Builtin

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Builtin

impl Debug for Builtin

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

Formats the value using the given formatter.

impl Eq for Builtin

impl PartialEq for Builtin

fn eq(&self, other: &Builtin) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Builtin