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enh(core) add [[nodiscard]] attribute for weak/shared_ptr::lock()

Marc SCHWEITZER requested to merge 588-core-use-nodiscard-attribute-for-weak_ptr-lock into dev

Description

Adds [[nodiscard]] attributes in weak_ptr and shared_ptr lock() function. This avoids using lock() as lock function and force user to use returned lock_ptr object

Closes #588 (closed)

How to test it?

Compile all, check for nodiscard warnings.

Edited by Marc SCHWEITZER

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