RosettaCodeData/Task/Array-concatenation/ALGOL-68/array-concatenation.alg

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MODE ARGTYPE = INT;
MODE ARGLIST = FLEX[0]ARGTYPE;
OP + = (ARGLIST a, b)ARGLIST: (
[LWB a:UPB a - LWB a + 1 + UPB b - LWB b + 1 ]ARGTYPE out;
(
out[LWB a:UPB a]:=a,
out[UPB a+1:]:=b
);
out
);
# Append #
OP +:= = (REF ARGLIST lhs, ARGLIST rhs)ARGLIST: lhs := lhs + rhs;
OP PLUSAB = (REF ARGLIST lhs, ARGLIST rhs)ARGLIST: lhs := lhs + rhs;
# Prefix #
OP +=: = (ARGLIST lhs, REF ARGLIST rhs)ARGLIST: rhs := lhs + rhs;
OP PLUSTO = (ARGLIST lhs, REF ARGLIST rhs)ARGLIST: rhs := lhs + rhs;
ARGLIST a := (1,2),
b := (3,4,5);
print(("a + b",a + b, new line));
VOID(a +:= b);
print(("a +:= b", a, new line));
VOID(a +=: b);
print(("a +=: b", b, new line))