KITFORMA · EDITORIAL ANSWER
Can I assume a moved-from std::string is empty?
KitForma editorial guide. The general moved-from guarantee for many library types is valid but unspecified state unless a stronger rule is documented. Observing empty in one implementation is not a business postcondition.
Step-by-step answer
The general moved-from guarantee for many library types is valid but unspecified state unless a stronger rule is documented. Observing empty in one implementation is not a business postcondition.
Assign a known value before reuse, or call only operations whose preconditions you can establish. Check empty before accessing a character. Represent workflow state separately from a library’s moved-from representation.
Test that no branch depends on the source becoming empty. Moving again is not necessarily invalid when its preconditions hold, but may be logically wrong. Consult the specific type: unique_ptr and other objects may provide stronger guarantees than the general rule, so neither assume everything is empty nor everything is unusable.
Sources and verification
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