Arno Schoedl
The C++ rvalue lifetime disaster
#1about 3 minutes
The dual role of rvalue references in C++
Rvalue references were introduced for move semantics to avoid copies but are also used to manage the lifetime of temporary objects.
#2about 6 minutes
Why temporary lifetime extension fails in modern C++
The pre-C++11 feature for extending temporary object lifetimes does not work correctly with rvalue references, necessitating a custom macro to create a value or reference based on expression type.
#3about 6 minutes
How accessor methods cause rvalue amnesia
Standard accessor methods returning a const lvalue reference incorrectly bind to rvalues, losing critical lifetime information and leading to dangling references.
#4about 4 minutes
A proposal for fixing C++ reference binding rules
A proposed language fix using pragmas would introduce new, safer reference binding rules to prevent short-lived rvalues from binding to long-lived lvalue references.
#5about 3 minutes
Practical mitigations for rvalue lifetime issues today
Use custom macros to manage variable lifetimes, guard member accessors, and implement a correct ternary operator to work around the language's flawed binding rules.
#6about 1 minute
Managing C++ complexity with strong coding guidelines
The best way to manage the growing complexity of C++ is to establish strong internal coding guidelines and use custom libraries to standardize code patterns.
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TypeScript
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+3
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