How to better understand parameter binding rules

Is this a true limitation or I am just not understanding the usage?

Drogon's CSP Syntax Limitation

The <%view%> directive seems to be primarily for rendering subtemplates, but it doesn't automatically forward variables from the parent context.

Unlike some templating engines (e.g., Jinja2, Django), Drogon requires explicit parameter passing.

This
```
<%c++
if (!recommendedUsers.empty()) {
for (const auto& user : recommendedUsers) {
%>
<%view user_card_connected user=user %>
<%c++
}
} else {
%>

No recommended users found.

<%c++
}
%>
```

The user_card_connected.csp holds something like this `<%c++ $$ << user.username; %>`

Fails to work with the error

> keFiles/wahalao.dir/Unity/unity_6_cxx.cxx:22:
> /Applications/dev/cplusplus/wahalao/build/generated_views/module_network/user_card_connected.cc:23:36: error: use of undeclared identifier 'user'
> 23 | user_card_connected_tmp_stream << user.username;
> | ^
> 1 error generated.
> ninja: build stopped: subcommand failed.
> ✗ C++ build FAILED.
>