# Trait ConstParamTy_

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    pub trait ConstParamTy_:
        UnsizedConstParamTy
        + StructuralPartialEq
        + Eq { }

🔬This is a nightly-only experimental API. (`unsized_const_params` #95174)
Expand description

A marker for types which can be used as types of `const` generic parameters.

These types must have a proper equivalence relation (`Eq`) and it must be automatically derived (`StructuralPartialEq`). There’s a hard-coded check in the compiler ensuring that all fields are also `ConstParamTy`, which implies that recursively, all fields are `StructuralPartialEq`.

## Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

## Implementors§

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### impl ConstParamTy_ for AtomicOrdering

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### impl ConstParamTy_ for bool

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### impl ConstParamTy_ for char

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### impl ConstParamTy_ for i8

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### impl ConstParamTy_ for i16

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### impl ConstParamTy_ for i32

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### impl ConstParamTy_ for i64

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### impl ConstParamTy_ for i128

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### impl ConstParamTy_ for isize

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### impl ConstParamTy_ for u8

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### impl ConstParamTy_ for u16

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### impl ConstParamTy_ for u32

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### impl ConstParamTy_ for u64

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### impl ConstParamTy_ for u128

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### impl ConstParamTy_ for ()

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### impl ConstParamTy_ for usize

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### impl ConstParamTy_ for Assume

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### impl<T: ConstParamTy_> ConstParamTy_ for (T₁, T₂, …, Tₙ)

This trait is implemented for tuples up to twelve items long.

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### impl<T: ConstParamTy_, const N: usize> ConstParamTy_ for [T; N]