Enum Std 

pub enum Std {
    C89,
    C99,
    C11,
    C17,
    C23,
    C2y,
}

Which C the source is written in.

The GNU variants are the same language with __STRICT_ANSI__ left undefined, so the dialect and the extension question are two fields rather than ten variants.

Variants

C89

-std=c89, and -ansi.

C99

-std=c99.

C11

-std=c11.

C17

-std=c17, which is C11 with the defect reports applied.

C23

-std=c23. The default, matching current GCC.

C2y

-std=c2y, the draft after C23, which gcc 16 takes and reports as 202500L. It is C23 with whatever the next standard has added so far, and the one addition anything here reads yet is the four unsigned absolute value functions under their plain names.

Implementations

impl Std

pub const fn stdc_version(self) -> Option<&'static str>

What __STDC_VERSION__ says, which C89 does not define at all.

pub const fn as_str(self) -> &'static str

The name in -std=.

pub const fn has_c11(self) -> bool

Whether this dialect has _Atomic, _Thread_local and the rest of C11.

pub fn from_flag(name: &str) -> Option<(Std, bool)>

Reads a -std= argument, and says whether the GNU extensions came with it.

Every alias GCC takes is here, including the iso9899 spellings and the year based ones, because a build system that passes -std=iso9899:1999 is passing what its author tested against and rejecting it helps nobody. An unknown dialect is None rather than a guess, since guessing means compiling a different language than the one asked for.

Trait Implementations

impl Clone for Std

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Std

impl Debug for Std

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

Formats the value using the given formatter.

impl Default for Std

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Std

impl Hash for Std

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Std

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for Std

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Std

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Std