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Home/ Questions/Q 675129
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Editorial Team
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Editorial Team
Asked: May 14, 20262026-05-14T00:47:03+00:00 2026-05-14T00:47:03+00:00

If I have have some overloaded ostream operators, defined for library local objects, is

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If I have have some overloaded ostream operators, defined for library local objects, is its okay for them to go to std namespace? If I do not declare them in std namespace, then I must use using ns:: operator <<.

As a possible follow-up question, are there any operators which should go to standard or global namespace?

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  1. Editorial Team
    Editorial Team
    2026-05-14T00:47:03+00:00Added an answer on May 14, 2026 at 12:47 am

    According to Koenig Lookup (C++ Standard 3.4.2) operator<< will be searched in namespaces of arguments. No need to declare it in std namespace.

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