Memory allocators

When compiling contracts to wasm, your code needs to be no-std. This means that instead of using the standard library, the core crate will be linked to your code. This crate does not contain a memory allocator.

Happily, Odra automatically enables allocator - from our tests the one developed by ink! seems to be the best.

Using a different allocator

If the default allocator does not suit your needs, or you use a crate that already provides an allocator, you can disable the default allocator by enabling the disable-allocator feature in the odra dependency in your project:

[dependencies]
odra = { path = "../odra", features = ["disable-allocator"] }

If you want to have a better control over the features that are enabled during the building and tests, see the next article on building manually.