Summary

Adds [[nodiscard]] attribute and documentation to createView() and createLocalView() methods to help prevent use-after-free bugs.

Problem

Since POCO 1.11, these methods return AbstractConfiguration::Ptr (AutoPtr) instead of raw pointers. Code that assigns the return value to a raw pointer compiles but causes use-after-free:

// WRONG - compiles but crashes!
AbstractConfiguration* view = cfg->createView("prefix");
view->keys(keys);  // use-after-free

// CORRECT
AbstractConfiguration::Ptr view = cfg->createView("prefix");
// or: auto view = cfg->createView("prefix");

Changes

• Added [[nodiscard]] attribute to warn when return value is discarded
• Added documentation noting that the return value must be assigned to Ptr, not raw pointer

Related: Migration note added to CHANGELOG.md on branch 4383-rename-changelog.