39 lines
1.1 KiB
Markdown
39 lines
1.1 KiB
Markdown
Advanced Usage – Restore `NativeCallContext`
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==================================================
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{{#include ../links.md}}
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The [`NativeCallContext`] type encapsulates the entire _context_ of a script up to the
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particular point of the native Rust function call.
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The data inside a [`NativeCallContext`] can be stored (as a type `NativeCallContextStore`) for later
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use, when a new [`NativeCallContext`] can be constructed based on these stored data.
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A reconstructed [`NativeCallContext`] acts almost the same as the original instance, so it is possible
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to suspend the evaluation of a script, and to continue at a later time with a new
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[`NativeCallContext`].
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Doing so requires the [`internals`] feature to access internal APIs.
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### Step 1: Store `NativeCallContext` data
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```rust
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// Store context for later use
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let context_data = context.store_data();
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// ... store 'context_data' somewhere ...
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secret_database.push(context_data);
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```
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### Step 2: Restore `NativeCallContext`
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```rust
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// ... do something else ...
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// Restore the context
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let context_data = secret_database.get();
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let new_context = context_data.create_context(&engine);
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```
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