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langref: more explicitly document how enum overriding works

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zooster 2022-12-26 23:54:27 +01:00 committed by Veikka Tuominen
parent 3a7a39cb91
commit 547e3684be
1 changed files with 17 additions and 2 deletions
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doc/langref.html.in
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@ -3633,9 +3633,8 @@ const Value = enum(u2) {
one, one,
two, two,
}; };
// Now you can cast between u2 and Value. // Now you can cast between u2 and Value.
// The ordinal value starts from 0, counting up for each member. // The ordinal value starts from 0, counting up by 1 from the previous member.
test "enum ordinal value" { test "enum ordinal value" {
try expect(@enumToInt(Value.zero) == 0); try expect(@enumToInt(Value.zero) == 0);
try expect(@enumToInt(Value.one) == 1); try expect(@enumToInt(Value.one) == 1);
@ -3654,6 +3653,22 @@ test "set enum ordinal value" {
try expect(@enumToInt(Value2.million) == 1000000); try expect(@enumToInt(Value2.million) == 1000000);
} }
// You can also override only some values.
const Value3 = enum(u4) {
a,
b = 8,
c,
d = 4,
e,
};
test "enum implicit ordinal values and overridden values" {
try expect(@enumToInt(Value3.a) == 0);
try expect(@enumToInt(Value3.b) == 8);
try expect(@enumToInt(Value3.c) == 9);
try expect(@enumToInt(Value3.d) == 4);
try expect(@enumToInt(Value3.e) == 5);
}
// Enums can have methods, the same as structs and unions. // Enums can have methods, the same as structs and unions.
// Enum methods are not special, they are only namespaced // Enum methods are not special, they are only namespaced
// functions that you can call with dot syntax. // functions that you can call with dot syntax.