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Asked: 2026-05-10T21:40:03+00:00

Suppose I have code like this: template<class T, T initial_t> class Bar { //

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Suppose I have code like this:

template<class T, T initial_t> class Bar {   // something }

And then try to use it like this:

Bar<Foo*, NULL> foo_and_bar_whatever_it_means_;

GCC bails out with error (on the above line):

could not convert template argument ‘0’ to ‘Foo*’

I found this thread: http://gcc.gnu.org/ml/gcc-help/2007-11/msg00066.html, but I have to use NULL in this case (ok, I could probably refactor – but it would not be trivial; any suggestions?). I tried to overcome the problem by creating a variable with value of NULL, but GCC still complains that I pass variable and not address of variable as a template argument. And reference to a variable initialized with default ctor would not be the same as NULL.

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1 Answer

  1. Rethinking your code is probably the best way to get around it. The thread you linked to includes a clear quote from the standard indicating that this isn’t allowed.

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