Conceptnull reference / 空指针 / null pointer
Null Reference
A programming concept introduced by Tony Hoare in 1965 within the ALGOL W language, denoting a reference value that points to no object. Because it frequently causes program crashes and security vulnerabilities, Hoare himself described it as his 'billion-dollar mistake'.
Timeline (last 90 days)
Sep 30
Tony Hoare introduced the null reference in 1965.
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Sep 30
In his 2009 QCon talk, Tony Hoare called the null reference his "billion-dollar mistake," estimating it had caused approximately one billion dollars in losses over the past 40 years.
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