[−][src]Trait tracers_core::argtypes::ProbeArgWrapper

pub trait ProbeArgWrapper: Debug where
    Self::CType: ProbeArgNativeType<Self::CType>, {
    type CType: ProbeArgNativeTypeInfo;
    fn as_c_type(&self) -> Self::CType;

    fn default_c_value() -> Self::CType { ... }
}

This trait, a companion to ProbeArgType, wraps a supported type and on demand converts it to its equivalent C type. For scalar types that are directly supported there is no overhead to this wrapping, but many more complicated types, including Rust string types, need additional logic to produce a NULL-terminated byte array.

Associated Types

`type CType: ProbeArgNativeTypeInfo`

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Required methods

`fn as_c_type(&self) -> Self::CType`

Convert the probe argument from it's Rust type to one compatible with the native tracing library infrastructure.

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Provided methods

`fn default_c_value() -> Self::CType`

This is ugly but unavoidable. The underlying C type for an Opt is the same C type as T. We will use the default value for T to indicate a value of None. That will have to be good enough.

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Implementations on Foreign Types

`impl ProbeArgWrapper for bool`[src]

`type CType = i32`

`fn as_c_type(&self) -> Self::CType`[src]

`impl<'a> ProbeArgWrapper for &'a CStr`[src]

`type CType = *const c_char`

`fn as_c_type(&self) -> Self::CType`[src]

`impl<'a> ProbeArgWrapper for &'a CString`[src]

`type CType = *const c_char`

`fn as_c_type(&self) -> Self::CType`[src]

`impl ProbeArgWrapper for usize`[src]

`type CType = size_t`

`fn as_c_type(&self) -> Self::CType`[src]

`impl ProbeArgWrapper for isize`[src]

`type CType = ssize_t`

`fn as_c_type(&self) -> Self::CType`[src]

`impl ProbeArgWrapper for u64`[src]

`type CType = c_ulonglong`

`fn as_c_type(&self) -> Self::CType`[src]

`impl ProbeArgWrapper for i64`[src]

`type CType = c_longlong`

`fn as_c_type(&self) -> Self::CType`[src]

`impl ProbeArgWrapper for u32`[src]

`type CType = c_uint`

`fn as_c_type(&self) -> Self::CType`[src]

`impl ProbeArgWrapper for i32`[src]

`type CType = c_int`

`fn as_c_type(&self) -> Self::CType`[src]

`impl ProbeArgWrapper for u16`[src]

`type CType = c_ushort`

`fn as_c_type(&self) -> Self::CType`[src]

`impl ProbeArgWrapper for i16`[src]

`type CType = c_short`

`fn as_c_type(&self) -> Self::CType`[src]

`impl ProbeArgWrapper for u8`[src]

`type CType = c_uchar`

`fn as_c_type(&self) -> Self::CType`[src]

`impl ProbeArgWrapper for i8`[src]

`type CType = c_char`

`fn as_c_type(&self) -> Self::CType`[src]

`impl<T> ProbeArgWrapper for Option<T> where T: ProbeArgWrapper + Debug,` [src]

`type CType = <T as ProbeArgWrapper>::CType`

`fn as_c_type(&self) -> Self::CType`[src]

`impl<T> ProbeArgWrapper for *const T`[src]

`type CType = *const c_void`

`fn as_c_type(&self) -> Self::CType`[src]

`impl<'a> ProbeArgWrapper for Option<CString>`[src]

`type CType = *const c_char`

`fn as_c_type(&self) -> Self::CType`[src]

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Implementors

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