Enum Std 

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

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.

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) -> Std

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() -> Std

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: &Std) -> 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: &Std) -> bool

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Std

fn partial_cmp(&self, other: &Std) -> 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