File: modint.jl

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# This file is a part of Julia. License is MIT: http://julialang.org/license

module ModInts
export ModInt

import Base: +, -, *

immutable ModInt{n} <: Integer
    k::Int
    ModInt(k) = new(mod(k,n))
end

-{n}(a::ModInt{n}) = ModInt{n}(-a.k)
+{n}(a::ModInt{n}, b::ModInt{n}) = ModInt{n}(a.k+b.k)
-{n}(a::ModInt{n}, b::ModInt{n}) = ModInt{n}(a.k-b.k)
*{n}(a::ModInt{n}, b::ModInt{n}) = ModInt{n}(a.k*b.k)

Base.convert{n}(::Type{ModInt{n}}, i::Int) = ModInt{n}(i)
Base.promote_rule{n}(::Type{ModInt{n}}, ::Type{Int}) = ModInt{n}

Base.show{n}(io::IO, k::ModInt{n}) = print(io, "$(k.k) mod $n")
Base.showcompact(io::IO, k::ModInt) = print(io, k.k)

Base.inv{n}(a::ModInt{n}) = ModInt{n}(invmod(a.k, n))

end # module