How would one properly do a static_assert
within a constexpr
function? For example:
constexpr int do_something(int x)
{
static_assert(x > 0, "x must be > 0");
return x + 5;
}
This is not valid C++11 code, because a constexpr function must only contain a return statement. I don't think that the standard has an exception to this, although, the GCC 4.7 does not let me compile this code.
Best Answer
This is incorrect.
static_assert
in aconstexpr
function are fine. What is not fine is using function parameters in constant expressions, like you do it.You could throw if
x <= 0
. Calling the function in a context that requires a constant expression will then fail to compile