= is always required when you're assigning a value to the var. the
confusion might be that you can also have a declaration like
var bar []struct{a, b, c string}
where you don't assign a value to bar (meaning it will be null).
Really, the syntax is
var variableName Type = value
You can leave off either the "Type" or the "= value" but not both.
var bar = []struct{a, b, c string} {
{ "really", "long", "row"},
{ "many", "many", "rows"},
...
}
is just a special case where you've left off the "Type", and "value"
happens to be a composite literal expression. It could also be written as
var bar []struct{a, b, c string} = []struct{a, b, c string} {
{ "really", "long", "row"},
{ "many", "many", "rows"},
...
}
On Thu, Jun 6, 2019 at 2:47 PM 'Aaron Spangler' via golang-nuts <
golang-nuts@googlegroups.com> wrote:
> Thank you! You are correct. That was exactly my problem. Adding the
> equals sign (=) solved it.
>
> I guess I need to be more aware that sometimes an equals statement is
> required on a 'var' line and other times it is not. (perhaps only when it
> has a literal)
>
> Thanks again!
>
> On Thu, Jun 6, 2019 at 11:05 AM Ian Lance Taylor <i...@golang.org> wrote:
>
>> On Thu, Jun 6, 2019 at 10:56 AM ajs via golang-nuts
>> <golang-nuts@googlegroups.com> wrote:
>> >
>> > I can declare literal bar inside a function like this:
>> >
>> > func foo() {
>> > bar := []struct{a, b, c string} {
>> > { "really", "long", "row"},
>> > { "many", "many", "rows"},
>> > ...
>> > }
>> > }
>> >
>> > But I really want it anchored (for code generation reason) outside of a
>> function like this:
>> >
>> > func foo() {
>> > ...
>> > }
>> >
>> > var bar []struct{a, b, c string} {
>> > { "really", "long", "row"},
>> > { "many", "many", "rows"},
>> > ...
>> > }
>> >
>> > The problem is it gets upset on the last character of the 'var bar ...'
>> line. Is there a better way to write this?
>> > Note for reasons outside of this discussion, I really want to avoid
>> writing it by repeating the discrete field names:
>> >
>> > var bar []struct{a, b, c string} {
>> > {a: "really",b: "long",c: "row"}, // Don't want to do this
>> > {a: "many", b: "many", c: "rows"}, // Don't want to do this
>> > ...
>> > }
>> >
>> > Any thoughts? What am I missing?
>>
>> An important tip: when asking a question, please tell us precisely
>> what you did and precisely what happened. You can see what happened,
>> but when you write "it gets upset" we have to guess. And it's easy
>> for us to guess wrong.
>>
>> When I look at
>>
>> var bar []struct{a, b, c string} {
>> { "really", "long", "row"},
>> { "many", "many", "rows"},
>> ...
>> }
>>
>> what I think is that it should say
>>
>> var bar = []struct{...
>>
>> That is, you are missing the "=". But I don't know if that was a typo
>> in the e-mail message. So if that doesn't help tell us exactly what
>> you did and exactly what happened.
>>
>> Ian
>>
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