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a special last variable in for loops (experimental)

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This commit is contained in:
Alexander Medvednikov
2019-11-05 17:15:19 +03:00
parent d279cedd28
commit 425c9ce401
2 changed files with 23 additions and 0 deletions
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9
vlib/compiler/parser.v
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@ -3377,6 +3377,15 @@ fn (p mut Parser) for_st() {
else if is_arr {
typ = typ[6..]// all after `array_`
p.gen_for_header(i, tmp, typ, val)
p.register_var(Var {
name: 'last'
typ: 'bool'
is_mut: false
is_used: true
})
// TODO don't generate if it's not used.
// Otherwise it's a C warning + perf.
p.genln('bool last = $i == $tmp . len - 1;')
}
else if is_str {
typ = 'byte'