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names_as_array returns an incorrect type when the input has zero fields #165

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anarthal opened this issue Mar 21, 2024 · 1 comment
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@anarthal
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Compiler: gcc13.1, Linux
Boost 1.84
Godbolt: https://godbolt.org/z/xxT1Tsoe7
Description: when names_as_array is called on a struct with no fields, std::array<std::nullptr_t, N> is returned, rather than std::array<std::string_view, 0>. This makes generic code more difficult.

#include <boost/pfr.hpp>

namespace pfr = boost::pfr;

struct MyType {};

int main()
{
    std::array<std::string_view, 0> names = pfr::names_as_array<MyType>(); 
}
@anarthal
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Happens on clang-19 (on my machine) too.

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