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Editorial Team
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Asked: 2026-05-13T19:00:55+00:00

I have several maps containing a multitude of classes in my VC++ project, some

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I have several maps containing a multitude of classes in my VC++ project, some of them default constructable, others not. When trying to build, I get a “no appropriate default constructor available” error. The problem is that the error is listed to occur in line 173 of map.cpp, which is the code for operator[]. It would seem that I’m accidentally calling operator[] (which implicitly calls the mapped type’s default constructor) on one of my non-default constructable maps, but VS doesn’t give me any info on where the error originated.

How can I find the part in my code that’s causing this problem?

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1 Answer

  1. Editorial Team

    You’re probably looking inside the error list window. Which I don’t use that often for C++ projects.

    Go to the output window and check a little further down, you should be able to double click the line that will bring you to the type in question.

    Doing a search for : error inside the output window is very common for me as well as : fatal to find the source of the errors. Also if you have C++ keyboard shortcuts setup you can keep hitting F4 to go down the list of errors.

    To reset to the default C++ keyboard mappings:
    Options -> Environment -> Keyboard
    Then reset keyboard mappings to: Visual C++ 6.

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