Nim/tests/cpp/tretvar.nim at devel · googol-lab/Nim

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discard """

targets: "cpp"

output: '''test1

xest1

'''

"""

{.passC: "-std=c++14".}

{.experimental: "dotOperators".}

import macros

type

stdString {.importcpp: "std::string", header: "<string>".} = object

stdUniquePtr[T] {.importcpp: "std::unique_ptr", header: "<memory>".} = object

proc c_str(a: stdString): cstring {.importcpp: "(char *)(#.c_str())", header: "<string>".}

proc len(a: stdString): csize {.importcpp: "(#.length())", header: "<string>".}

proc setChar(a: var stdString, i: csize, c: char) {.importcpp: "(#[#] = #)", header: "<string>".}

proc `*`*[T](this: stdUniquePtr[T]): var T {.noSideEffect, importcpp: "(* #)", header: "<memory>".}

proc make_unique_str(a: cstring): stdUniquePtr[stdString] {.importcpp: "std::make_unique<std::string>(#)", header: "<string>".}

macro `.()`*[T](this: stdUniquePtr[T], name: untyped, args: varargs[untyped]): untyped =

result = nnkCall.newTree(

nnkDotExpr.newTree(

newNimNode(nnkPar).add(prefix(this, "*")),

name

)

copyChildrenTo(args, result)

var val = make_unique_str("test1")

echo val.c_str()

val.setChar(0, 'x')

echo val.c_str()