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/*! Assertions done on the type-level,mostly for tests. */ use TypeIdentity; use std_::marker::PhantomData; /// Struct used to assert that its type parameters are the same type. /// /// This is most useful in tests,to make sure that types are the same. /// /// # Example /// /// ``` /// use core_extensions::type_asserts::AssertEq; /// /// let _:AssertEq<u32,u32>; /// let _=AssertEq::new( &0u32, &0u32 ); /// /// ``` /// /// # Non-compiling /// /// ```compile_fail /// use core_extensions::type_asserts::AssertEq; /// /// let _:AssertEq<(),u32>; /// let _=AssertEq::new( &(), &0u32 ); /// /// ``` /// /// ```compile_fail /// use core_extensions::type_asserts::AssertEq; /// /// let _:AssertEq<u32,()>; /// let _=AssertEq::new( &0u32, &() ); /// /// ``` /// pub struct AssertEq<L:?Sized,R:?Sized> where L:TypeIdentity<Type=R> { _marker:PhantomData<( PhantomData<L>, PhantomData<R>, )>, } impl<A> AssertEq<A,A>{ /// Constructs an AssertEq. pub fn new(_:A,_:A)->Self{ Self{_marker:PhantomData} } } /// Struct used to assert that its type parameters are the same type. /// /// # Example /// /// ``` /// use core_extensions::type_asserts::AssertEq3; /// /// let _:AssertEq3<u32,u32,u32>; /// let _=AssertEq3::new( &0u32, &0u32, &0u32 ); /// /// ``` /// /// # Non-compiling /// /// ```compile_fail /// # use core_extensions::type_asserts::AssertEq3; /// let _:AssertEq3<(),u32,u32>; /// let _=AssertEq3::new( &(), &0u32, &0u32 ); /// ``` /// /// ```compile_fail /// # use core_extensions::type_asserts::AssertEq3; /// let _:AssertEq3<u32,(),u32>; /// let _=AssertEq3::new( &0u32, &(), &0u32 ); /// ``` /// /// ```compile_fail /// # use core_extensions::type_asserts::AssertEq3; /// let _:AssertEq3<u32,u32,()>; /// let _=AssertEq3::new( &0u32, &0u32, &() ); /// ``` /// pub struct AssertEq3<A:?Sized,B:?Sized,C:?Sized> where A:TypeIdentity<Type=B>, A:TypeIdentity<Type=C>, { _marker:PhantomData<( PhantomData<A>, PhantomData<B>, PhantomData<C>, )>, } impl<A> AssertEq3<A,A,A>{ /// Constructs an AssertEq3. pub fn new(_:A,_:A,_:A)->Self{ Self{_marker:PhantomData} } } /// Struct used to assert that its type parameters are the same type. /// /// # Example /// /// ``` /// use core_extensions::type_asserts::AssertEq4; /// /// let _:AssertEq4<u32,u32,u32,u32>; /// let _=AssertEq4::new( &0u32, &0u32, &0u32, &0u32 ); /// /// ``` /// /// # Non-compiling /// /// ```compile_fail /// # use core_extensions::type_asserts::AssertEq4; /// let _:AssertEq4<(),u32,u32,u32>; /// let _=AssertEq4::new( &(), &0u32, &0u32, &0u32 ); /// ``` /// /// ```compile_fail /// # use core_extensions::type_asserts::AssertEq4; /// let _:AssertEq4<u32,(),u32,u32>; /// let _=AssertEq4::new( &0u32, &(), &0u32, &0u32 ); /// ``` /// /// ```compile_fail /// # use core_extensions::type_asserts::AssertEq4; /// let _:AssertEq4<u32,u32,(),u32>; /// let _=AssertEq4::new( &0u32, &0u32, &(), &0u32 ); /// ``` /// /// ```compile_fail /// # use core_extensions::type_asserts::AssertEq4; /// let _:AssertEq4<u32,u32,u32,()>; /// let _=AssertEq4::new( &0u32, &0u32, &0u32, &() ); /// ``` /// pub struct AssertEq4<A:?Sized,B:?Sized,C:?Sized,D:?Sized> where A:TypeIdentity<Type=B>, A:TypeIdentity<Type=C>, A:TypeIdentity<Type=D>, { _marker:PhantomData<( PhantomData<A>, PhantomData<B>, PhantomData<C>, PhantomData<D>, )>, } impl<A> AssertEq4<A,A,A,A>{ /// Constructs an AssertEq4. pub fn new(_:A,_:A,_:A,_:A)->Self{ Self{_marker:PhantomData} } } ////////////////////////////////////////////////////////////////////////////////