28 lines
886 B
Julia
28 lines
886 B
Julia
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# This is just a super simple example to illustrate the "call" operator.
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# Simple polynomial type. The Polynomials.jl package is basically a more
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# complete version of this example.
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struct Poly{T}
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coeffs::Vector{T}
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end
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# Could implement a whole bunch of operators (+, -, *, /, show, etc.)
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# but that can be left as an exercise for the reader :3
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# Also the Polynomials.jl package have implemented most of those.
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# Here, the whole point of this example; This function basically makes
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# the variable, p, act as a polynomial function on x.
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function (p::Poly{T})(x::T) where T <: Number
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ret = zero(T)
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for i in 1 : length(p.coeffs)
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ret += p.coeffs[i] * x^(i - 1)
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end
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ret
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end
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# Now any variable of type Poly can be used as if it was a function
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# This gives some really clean syntax :)
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p = Poly([0.0, -3.0, 0.0, 1.0]) # p = 0 - 3 x + 0 x^2 + 1 x^3
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@show p(3.0)
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