Which seems like an acceptable error message. Unfortunately, it is rather likely that this gets fixed in 3.3, too.
How about this variant that defines inverse() ?
$ g++ -c bug.c
bug.c: In function `void c_area(const xform_split&, const box&, const box&)':
bug.c:32: error: parse error before `,' token
$
class ltransform { public: };
class box { public: box insidebox() const; };
class parallelogram { public: parallelogram(const ltransform& b, const box& x); box insidebox() const; };
box inverse_image(const box& db1, const ltransform& fwd);
ltransform inverse(const ltransform& x);
struct xform_split { ltransform fwd; ltransform back; };
void c_area(const xform_split &xf, const box& databox0, const box& databox1) { const box box0inOUTin( parallelogram(inverse(xf.back), databox0).insidebox()); const box lc(inverse_image(databox1, xf.fwd)); }
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