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one-definition rule (ODR) [ ISO/IEC 14882-2014 ]
A fundamental C++ rule that states that no translation unit shall contain more than one definition of any variable, function, class type, enumeration type or template, and that every program shall contain exactly one definition of every non-inline function or variable. Some definitions may be duplicated in multiple translation units, subject to strict rules.
Anchor odr-use odr-use
ODR-use [ ISO/IEC 14882-2014 ]
A function or object is ODR-used if the address of the entity is taken, the function is called, or a reference is bound to the object. When a function or object is ODR-used, its definition must exist within the program or else the program is ill-formed.
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