Struct std::ffi::VaList

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#[repr(transparent)]
pub struct VaList<'a, 'f>where 'f: 'a,{ /* private fields */ }
🔬This is a nightly-only experimental API. (c_variadic #44930)
Expand description

va_list 的包装

Methods from Deref<Target = VaListImpl<'f>>§

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pub fn as_va_list<'a>(&'a mut self) -> VaList<'a, 'f>

🔬This is a nightly-only experimental API. (c_variadic #44930)

VaListImpl 转换为与 C 的 va_list 二进制兼容的 VaList

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pub unsafe fn arg<T>(&mut self) -> Twhere T: VaArgSafe,

🔬This is a nightly-only experimental API. (c_variadic #44930)

前进到下一个 arg。

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pub unsafe fn with_copy<F, R>(&self, f: F) -> Rwhere F: for<'copy> FnOnce(VaList<'copy, 'f>) -> R,

🔬This is a nightly-only experimental API. (c_variadic #44930)

在当前位置复制 va_list

Trait Implementations§

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impl<'a, 'f> Debug for VaList<'a, 'f>where 'f: 'a,

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

使用给定的格式化程序格式化该值。 Read more
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impl<'a, 'f> Deref for VaList<'a, 'f>where 'f: 'a,

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type Target = VaListImpl<'f>

解引用后的结果类型。
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fn deref(&self) -> &VaListImpl<'f>

解引用值。
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impl<'a, 'f> DerefMut for VaList<'a, 'f>where 'f: 'a,

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fn deref_mut(&mut self) -> &mut VaListImpl<'f>

可变地解引用该值。

Auto Trait Implementations§

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impl<'a, 'f> RefUnwindSafe for VaList<'a, 'f>

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impl<'a, 'f> !Send for VaList<'a, 'f>

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impl<'a, 'f> !Sync for VaList<'a, 'f>

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impl<'a, 'f> Unpin for VaList<'a, 'f>

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impl<'a, 'f> !UnwindSafe for VaList<'a, 'f>

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

获取 selfTypeIdRead more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

从拥有的值中一成不变地借用。 Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

从拥有的值中借用。 Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

返回未更改的参数。

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

调用 U::from(self)

也就是说,这种转换是 From<T> for U 实现选择执行的任何操作。

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

发生转换错误时返回的类型。
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

执行转换。
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

发生转换错误时返回的类型。
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

执行转换。