# Two ways to define types
I think you have discovered that defining a GraphqlQL type can be use attribute macro or derive.
The following is the corresponding table:
|Enum|Enum|GQLEnum|
|Simple Object|SimpleObject|GQLSimpleObject|
|Input Object|InputObject|GQLInputObject|
|Interface|Interface|GQLInterface|
|Union|Union|GQLUnion|
|Merged Object|MergedObject|GQLMergedObject|
|Merged Subscription|MergedSubscription|GQLMergedSubscription|
The advantage of attribute macro is that you can provide some parameters at the same time, for example：
```rust
#[SimpleObject(name = "ABC")]
struct MyObject {
value: i32,
}
```
**But it does not support conditional compilation**, for example:
```rust
#[SimpleObject]
struct MyObject {
#[cfg(windows)]
value: i32,
#[cfg(not(windows))]
value: i32,
}
```
**Derive can support conditional compilation**, but it needs to provide parameters separately, for example:
```rust
#[derive(SimpleObject)]
#[graphql(name = "ABC")]
struct MyObject {
value: i32,
}
```
_Which way to define the type is up to you, I prefer to use derive._