https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65815
--- Comment #5 from andras.aszodi at csf dot ac.at ---
If the array is a class member and it is initialized in-class then the
"single-brace" syntax gets flagged. Please try the following example:
// ----- file clarrinit.cc --
#include <array>
#include <iostream>
class Fred {
public:
const std::array<double, 2>& arr() const { return _a; }
private:
std::array<double, 2> _a = {1.0, 2.0}, // error
_b{3.0, 4.0}, // error
_c{{5.0, 6.0}}; // OK
};
int main(int argc, char *argv[]) {
Fred f;
std::cout << f.arr()[0] << std::endl;
}
// ----
Platform: Raspberry Pi 2, OS is Raspbian (not that it should matter IMO)
Command: `g++-4.9 -g -std=c++11 clarrinit.cc -o clarrinit`
Output:
error: array must be initialized with a brace-enclosed initializer
std::array<double, 2> _a = {1.0, 2.0},
^
clarrinit.cc:9:39: error: too many initializers for ‘std::array<double, 2u>’
clarrinit.cc:10:16: error: array must be initialized with a brace-enclosed
initializer
_b{3.0, 4.0},
^
clarrinit.cc:10:16: error: too many initializers for ‘std::array<double, 2u>’
