Reading & Writing

When dealing with storage we have two options, we can either read from or write to storage. In both cases we must use a storage annotation to indicate the purity of the function.

When referencing a variable in storage we must explicitly indicate that the variable comes from storage and not a local scope.

This is done via the syntax storage.variable_name e.g. storage.counter.

{{#include ../../../code/operations/storage/reading_writing_to_storage/src/main.sw:declaration}}

Reading from Storage

When dealing with a built-in type we can retrieve the variable without the use of any special methods.

{{#include ../../../code/operations/storage/reading_writing_to_storage/src/main.sw:read}}

Writing to Storage

When dealing with a built-in type we can update the variable without the use of any special methods.

{{#include ../../../code/operations/storage/reading_writing_to_storage/src/main.sw:write}}

Read & Write

We can read and write to storage by using both keywords in the attribute.

{{#include ../../../code/operations/storage/reading_writing_to_storage/src/main.sw:read_write}}