Module scrypto::prelude::radix_engine_common::prelude::index_set

The methods and macros provided directly in this index_set module (new, with_capacity) work in both std and no-std modes - unlike the corresponding methods on IndexSet itself.

Unfortunately IndexSet is very hard to use from no-std (see docs and relevant github issue). It uses a weird build.rs script to detect if no-std is present, which is hard to force unless you explicitly do eg a WASM build and see that it’s missing.

You can use these methods as follows:

use sbor::rust::collections::*;

let index_set: IndexSet<K> = index_set_new();
let index_set: IndexSet<K> = index_set_with_capacity(n);
let index_set = indexset!(1u32, 2u32);

Macros

• indexset

Functions

• new
  This is safe for std and no-std use cases (unlike IndexSet::new which disappears when std is not in the toolchain - see this article for deep technical reasons)
• with_capacity
  This is safe for std and no-std use cases (unlike IndexSet::with_capacity which disappears when std is not in the toolchain - see this article for deep technical reasons)

Type Aliases

• DefaultHashBuilder
• IndexSet