What is the namespace of tolower in transform function

  • 0

    When I wrote the code, I was struggling with the namespace specifier.
    So the code to transform from uppercase to lowercase is
    transform( s.begin(), s.end(), s.begin(), ::tolower)

    As for the last argument, where is the tolower function?
    Why would it not pass if I put std::tolower?
    what does "::" mean right here?

    Thanks for your help.

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