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Home/ Questions/Q 1016689
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Editorial Team
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Editorial Team
Asked: May 16, 20262026-05-16T10:35:10+00:00 2026-05-16T10:35:10+00:00

In the code below: template<typename T> struct X {}; int main() { X<int()> x;

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In the code below:

template<typename T>
struct X {};

int main()
{
  X<int()> x; // what is the type of T ?
}

What is the type of T? I saw something like this in the boost sources.

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  1. Editorial Team
    Editorial Team
    2026-05-16T10:35:11+00:00Added an answer on May 16, 2026 at 10:35 am

    Consider the function int func(). It has a function type int(void). It can be implicitly converted to pointer type as the C++ Standard says in 4.3/1, but it this case there’s no need in such conversion, so T has the function type int(void), not a pointer to it.

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