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template withOpenFile(f: expr, filename: string, mode: TFileMode,
actions: stmt): stmt {.immediate.} =
block:
# test that 'f' is implicitly 'injecting':
var f: TFile
if open(f, filename, mode):
try:
actions
finally:
close(f)
else:
quit("cannot open for writing: " & filename)
withOpenFile(txt, "ttempl3.txt", fmWrite):
writeln(txt, "line 1")
txt.writeln("line 2")
var
myVar: array[0..1, int]
# Test zero argument template:
template ha: expr = myVar[0]
ha = 1
echo(ha)
# Test identifier generation:
template prefix(name: expr): expr {.immediate.} = `"hu" name`
var `hu "XYZ"` = "yay"
echo prefix(XYZ)
template typedef(name: expr, typ: typeDesc) {.immediate, dirty.} =
type
`T name`* = typ
`P name`* = ref `T name`
typedef(myint, int)
var x: PMyInt
# Test UFCS
type
Foo = object
arg: int
proc initFoo(arg: int): Foo =
result.arg = arg
template create(typ: typeDesc, arg: expr): expr = `init typ`(arg)
var ff = Foo.create(12)
echo ff.arg
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