Why does this code:
constexpr float operator "" _deg(long double d) {
// returns radians
return d*3.1415926535/180;
}
static const float ANGLES[] = {-20_deg, -10_deg, 0_deg, 10_deg, 20_deg};
Produce 5 of these errors:
error: unable to find numeric literal operator 'operator"" _deg'
I am using GCC 4.7.3. (arm-none-eabi-g++
, with the -std=c++0x
flag).
It seems GCC doesn't do type conversions with user-defined literals, so e.g. the -10
in -10_deg
is considered to be an integer.
Add .0
to all numbers and it should hopefully work:
static const float ANGLES[] = {-20.0_deg, -10.0_deg, 0.0_deg, 10.0_deg, 20.0_deg};
Of course, you can also add another operator function taking int
as argument.
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