diff options
Diffstat (limited to 'doc/manual')
| -rw-r--r-- | doc/manual/var_t_return.rst | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/doc/manual/var_t_return.rst b/doc/manual/var_t_return.rst index c6de8cf7c..e34993e3e 100644 --- a/doc/manual/var_t_return.rst +++ b/doc/manual/var_t_return.rst @@ -1,6 +1,8 @@ -Memory safety for returning by ``var T`` is ensured by a simple borrowing -rule: If ``result`` does not refer to a location pointing to the heap -(that is in ``result = X`` the ``X`` involves a ``ptr`` or ``ref`` access) +.. default-role:: code + +Memory safety for returning by `var T` is ensured by a simple borrowing +rule: If `result` does not refer to a location pointing to the heap +(that is in `result = X` the `X` involves a `ptr` or `ref` access) then it has to be derived from the routine's first parameter: .. code-block:: nim @@ -11,10 +13,10 @@ then it has to be derived from the routine's first parameter: var x: int # we know 'forward' provides a view into the location derived from # its first argument 'x'. - result = forward(x) # Error: location is derived from ``x`` + result = forward(x) # Error: location is derived from `x` # which is not p's first parameter and lives # on the stack. -In other words, the lifetime of what ``result`` points to is attached to the +In other words, the lifetime of what `result` points to is attached to the lifetime of the first parameter and that is enough knowledge to verify memory safety at the call site. |