does_not_support_comparisons is a private member of libecap::Area

[Alex Rousskov]

The clang compiler cannot compile libecap v1.0.0 due to the following error:

/usr/include/libecap/common/area.h:60:77: error: 'does_not_support_comparisons' is a private member of 'libecap::Area'
template <typename T> bool operator ==(const Area &a, const T &) {
return a.does_not_support_comparisons(); }

GCC does not exhibit this problem.

[Alex Rousskov (rousskov)]

Libecap uses a defective (not portable enough) implementation of the C++ Safe Bool idiom. That attached patch from the FreeBSD libecap package fixes the problem. I have not yet tested this patch and the final fix may be different.

[Alex Rousskov (rousskov)]

The attached official fix is similar to the one in the FreeBSD package but should work better during Area development because it protects _internal_ Area code from accidentally using the unsupported Area comparison operator.