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https://github.com/nim-lang/Nim.git
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cbf66e99a8
Fixed the dot operator when used within return types (see tgenericdotrettype) Fixed the matching of generic concepts aliases used with the implicit generics style
82 lines
1.8 KiB
Nim
82 lines
1.8 KiB
Nim
discard """
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output: "0\n0\n0"
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msg: '''
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R=3 C=3 TE=9 FF=14 FC=20 T=int
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R=3 C=3 T=int
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'''
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"""
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import typetraits
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template ok(x) = assert x
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template no(x) = assert(not x)
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const C = 10
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type
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Matrix[Rows, Cols, TotalElements, FromFoo, FromConst: static[int]; T] = concept m, var mvar, type M
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M.M == Rows
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Cols == M.N
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M.T is T
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m[int, int] is T
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mvar[int, int] = T
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FromConst == C * 2
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# more complicated static param inference cases
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m.data is array[TotalElements, T]
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m.foo(array[0..FromFoo, type m[int, 10]])
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MyMatrix[M, K: static[int]; T] = object
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data: array[M*K, T]
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# adaptor for the concept's non-matching expectations
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template N(M: type MyMatrix): expr = M.K
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proc `[]`(m: MyMatrix; r, c: int): m.T =
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m.data[r * m.K + c]
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proc `[]=`(m: var MyMatrix; r, c: int, v: m.T) =
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m.data[r * m.K + c] = v
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proc foo(x: MyMatrix, arr: array[15, x.T]) = discard
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proc genericMatrixProc[R, C, TE, FF, FC, T](m: Matrix[R, C, TE, FF, FC, T]): T =
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static:
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echo "R=", R, " C=", C, " TE=", TE, " FF=", FF, " FC=", FC, " T=", T.name
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m[0, 0]
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proc implicitMatrixProc(m: Matrix): m.T =
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static:
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echo "R=", m.Rows,
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" C=", m.Cols,
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# XXX: fix these
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#" TE=", m.TotalElements,
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#" FF=", m.FromFoo,
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#" FC=", m.FromConst,
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" T=", m.T.name
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m[0, 0]
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proc myMatrixProc(x: MyMatrix): MyMatrix.T = genericMatrixProc(x)
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var x: MyMatrix[3, 3, int]
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static:
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# ok x is Matrix
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ok x is Matrix[3, 3, 9, 14, 20, int]
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no x is Matrix[3, 3, 8, 15, 20, int]
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no x is Matrix[3, 3, 9, 10, 20, int]
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no x is Matrix[3, 3, 9, 15, 21, int]
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no x is Matrix[3, 3, 9, 15, 20, float]
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no x is Matrix[4, 3, 9, 15, 20, int]
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no x is Matrix[3, 4, 9, 15, 20, int]
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echo x.myMatrixProc
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echo x.genericMatrixProc
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echo x.implicitMatrixProc
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