Merge pull request #1002 from Concordium/add-bump-alloc

Add bump alloc feature documentation

Author: DOBEN

source/mainnet/smart-contracts/guides/no-std.rst

@@ -37,46 +37,54 @@ You can update your `Cargo.toml` file by using:
 .. code-block:: rust
 
    [dependencies]
-   concordium-std = { version = "6.0", default-features = false }
+   concordium-std = { version = "10.0", default-features = false }
 
 .. note::
 
    To compile your smart contracts, a memory `allocator <https://docs.rs/concordium-std/6.0.0/concordium_std/#use-a-custom-allocator>`_ is used.
    ``concordium-std`` version ``<6.0.0`` hard-coded the use of the `wee_alloc <https://docs.rs/wee_alloc/>`_ allocator.
-   In ``concordium-std`` version ``>=6.0.0``, ``wee_alloc`` is a feature and needs to be explicitly enabled.
+   In ``concordium-std`` version in the range of ``>=6.0.0`` and ``<10.0.0``, ``wee_alloc`` is a feature and needs to be explicitly enabled.
+   In ``concordium-std`` version ``>=10.0.0``, `bump_alloc <https://docs.rs/concordium-std/10.0.0/concordium_std/#use-a-custom-allocator>`_ is a feature and needs to be explicitly enabled.
    When ``std`` feature is enabled, the allocator provided by the Rust standard library is used
-   by default but when the ``wee_alloc`` feature is enabled in addition, `wee_alloc <https://docs.rs/wee_alloc/>`_ is used instead.
+   by default but when the ``wee_alloc``/``bump_alloc`` feature is enabled in addition, `bump_alloc <https://docs.rs/concordium-std/10.0.0/concordium_std/#use-a-custom-allocator>`_ ( or `wee_alloc <https://docs.rs/wee_alloc/>`_) is used instead.
 
-   You can enable the ``std`` feature and the ``wee_alloc`` feature in ``concordium-std`` version ``>=6.0.0`` by using:
+   You can enable the ``std`` feature and the ``wee_alloc`` feature in ``concordium-std`` version in the range of ``>=6.0.0`` and ``<10.0.0`` by using:
 
    .. code-block:: rust
 
       [dependencies]
       concordium-std = {version = "6.0", features = ["wee_alloc"]}
 
-   Alternatively, if you want to test with and without ``wee_alloc`` enabled add a ``wee_alloc`` feature to the smart contract crate as follows:
+   You can enable the ``std`` feature and the ``bump_alloc`` feature in ``concordium-std`` version ``>=10.0.0`` by using:
+
+   .. code-block:: rust
+
+      [dependencies]
+      concordium-std = {version = "10.0", features = ["bump_alloc"]}
+
+   Alternatively, if you want to test with and without ``wee_alloc``/``bump_alloc`` enabled add a ``wee_alloc``/``bump_alloc`` feature to the smart contract crate as follows:
 
    .. code-block:: rust
 
       [features]
-      default = ["std", "wee_alloc"]
+      default = ["std", "bump_alloc"]
       std = ["concordium-std/std"]
-      wee_alloc = ["concordium-std/wee_alloc"]
+      bump_alloc = ["concordium-std/bump_alloc"]
 
-   The above code blocks will use the `wee_alloc <https://docs.rs/wee_alloc/>`_ allocator and not the allocator
+   The above code blocks will use the  `bump_alloc <https://docs.rs/concordium-std/10.0.0/concordium_std/#use-a-custom-allocator>`_ allocator and not the allocator
    provided by the Rust standard library when compiled with the default features as follows:
 
    .. code-block:: console
 
       $cargo concordium build
 
-When ``no_std`` is used either ``wee_alloc`` must be enabled, or another global allocator
-must be set in the smart contract. You can add the ``wee_alloc`` feature by using:
+When ``no_std`` is used either ``wee_alloc``/``bump_alloc`` must be enabled, or another global allocator
+must be set in the smart contract. You can add the ``wee_alloc``/``bump_alloc`` feature by using e.g.:
 
 .. code-block:: rust
 
    [features]
-   wee_alloc = ["concordium-std/wee_alloc"]
+   bump_alloc = ["concordium-std/bump_alloc"]
 
 To be able to toggle between with and without std, also add a ``std`` to your
 own module, which enables the ``std`` feature of ``concordium-std``:
@@ -104,12 +112,19 @@ you can pass extra arguments for ``cargo``:
 
 .. code-block:: console
 
-   $cargo +nightly concordium build -- --no-default-features --features wee_alloc
+   $cargo +nightly concordium build -- --no-default-features --features bump_alloc
 
 .. note::
 
-   The above command works with ``concordium-std`` version ``>=6.0.0``, because the
-   ``wee_alloc`` feature needs to be explicitly enabled.
+   The above command works with ``concordium-std`` version ``>=10.0.0``, because the
+   ``bump_alloc`` feature needs to be explicitly enabled.
+
+   If you use ``concordium-std`` version in the range of ``>=6.0.0`` and ``<10.0.0`` use the following instead:
+
+   .. code-block:: console
+
+      $cargo +nightly concordium build -- --no-default-features --features wee_alloc
+
    If you use ``concordium-std`` version ``<6.0.0`` use the following instead:
 
    .. code-block:: console