Re: appending newly initialized struct to array

[Kenji Hara]

On Tuesday, 17 April 2012 at 21:00:55 UTC, simendsjo wrote:

On Tue, 17 Apr 2012 22:28:31 +0200, maarten van damme <maartenvd1...@gmail.com> wrote:

Just for fun I decided to complete some codejam challenges in D. At some point I wanted to add structs to an array but I got a compiler error. What

am I doing wrong?

code:
struct test{
int x;
int y;
}
void main(){
test[] why;
why~={3,5};
}

error:
wait.d(7): found '}' when expecting ';' following statement
wait.d(8): found 'EOF' when expecting ';' following statement

wait.d(8): found 'EOF' when expecting '}' following compound statement

Is there any reason a why this wouldn't work?

Sounds like a bug. C style initializers work in other cases:

struct S { int i; }
void main() {
    S[] arr;
    S s = { 1 };
    arr ~= S(1);
    // But the following barfs
    //arr ~= { 1 };
    //arr ~= { i:1 };
    //arr[0] = { 1 };
}

No, it is designed. {3,5} is struct initializer:
http://dlang.org/declaration.html#StructInitializer
And it is only allowed in initializer of variable declarations.

why~={3,5};

This is concat assign expression, so you should use test(3,5)
instead of {3,5}. That is StructLiteral:
http://dlang.org/struct.html#StructLiteral
and it is an expression.

Bye.

Kenji Hara