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This nimble package contains theprotocol macro for easily implementinginterfacesin Nim.
Example:
import protocoledprotocol PExpr:proc eval(e):int impl PLiteral:var x:intproc eval(e):int= e.xproc newLit(x:int): PLiteral=result= PLiteral(x: x) impl PPlusExpr:var a, b: PExprproc eval(e):int= eval(e.a)+ eval(e.b)proc newPlus(a, b: PExpr): PPlusExpr=result= PPlusExpr(a: a, b: b)
Notice the typeless parametere, the macro takes care of assigning it theproper type. Then it is translated roughly into this code:
type PExpr=refobjectof RootObj## abstract base class for an expression evalImpl:proc(e: PExpr):int {.nimcall.} PLiteral=refobjectof PExpr x:int PPlusExpr=refobjectof PExpr a, b: PExprproc eval(e: PExpr):int= assert e.evalImpl!=nil e.evalImpl(e)proc evalLit(e: PExpr):int= PLiteral(e).xproc evalPlus(e: PExpr):int= eval(PPlusExpr(e).a)+ eval(PPlusExpr(e).b)proc newLit(x:int): PLiteral= PLiteral(evalImpl: evalLit, x: x)proc newPlus(a, b: PExpr): PPlusExpr= PPlusExpr(evalImpl: evalPlus, a: a, b: b)
- You need to separate the
selfparameter from the rest with a semicolon;. - The export marker
*is using infix notation like so:impl *Student. - In the constructor
proc, implicit return of the last expression is not supported.
This library is distributed under the MIT license. For more information seecopying.txt.
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Interface macro for nim
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