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Editorial Team
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Asked: 2026-06-17T09:24:43+00:00

Inside the <vector> header, there is code like this: _DEBUG_ERROR(vector iterator not dereferencable); _SCL_SECURE_OUT_OF_RANGE;

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Inside the <vector> header, there is code like this:

_DEBUG_ERROR("vector iterator not dereferencable");
_SCL_SECURE_OUT_OF_RANGE;

Which halts the program with a message and gives the programmer a chance to debug the code.

For a little toy project, I want to use _DEBUG_ERROR myself. It is defined in <xutility>.

However, when I include <xutility> and try to use _DEBUG_ERROR, I get the following error:

error C3861: "_Debug_message": identifier not found.

But _Debug_message is defined inside <xutility>, in line 28! Why does the compiler complain?

Also, is there another (maybe even somewhat portable?) way to halt the program for debugging?

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1 Answer

  1. Editorial Team

    Not 100% certain but I’m fairly sure it’s actually std::_Debug_message. And PlasmaHH is right: assert() is the normal solution. You can write assert(!"message") to get a custom message. (Note the !)

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