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Here is something I observed across various compilers. It seems there are compiler bugs. template <int I> struct X { }; int main(void) { X<(16 > 1)> a; // Works on vc9, works on g++ 4.1.2, works on Comeau 4.3.10.1 X<(int(16) > 1)> b; // Works on vc9, works on g++ 4.1.2, works on Comeau 4.3.10.1 X<(16 >> 1)> c; // Works on vc9, works on g++ 4.1.2, works on Comeau 4.3.10.1 X<(int(16) >> 1)> d; // Fails on vc9, works on g++ 4.1.2, works on Comeau 4.3.10.1 X<16 > 1> e; // Fails on vc9, works on g++ 4.1.2, fails on Comeau 4.3.10.1 X<int(16) > 1> f; // Fails on vc9, fails on g++ 4.1.2, fails on Comeau 4.3.10.1 X<16 >> 1> g; // Fails on vc9, works on g++ 4.1.2, fails on Comeau 4.3.10.1 X<int(16) >> 1> h; // Fails on vc9, works on g++ 4.1.2, fails on Comeau 4.3.10.1 } Why is that inconsistency? What is allowed/disallowed by the standard? Such behavior is also responsible for syntax error while using BOOST_AUTO on vc9. It appears to me that Comeau is doing the right job by rejecting all the expressions without parenthesis.

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