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#include <iostream>
#include <array>
using namespace std;
 
struct Foo
{
   static constexpr double bar = 1.23;
   static constexpr std::array<double, 4> acgt_default_background_frequencies = {0.281774, 0.222020, 0.228876, 0.267330};
};
 
int main() {
	cout << Foo::bar << endl; // this works
	cout << Foo::acgt_default_background_frequencies[0] << endl; // this doesn't work
	return 0;
}

/home/v7WAWh/ccGu0nTn.o: In function `main':
prog.cpp:(.text.startup+0x32): undefined reference to `Foo::acgt_default_background_frequencies'
prog.cpp:(.text.startup+0x38): undefined reference to `Foo::acgt_default_background_frequencies'
collect2: error: ld returned 1 exit status

Standard output is empty