Why does this std::sort predicate fail when the class is inside main()?

In C++03, local classes have no linkage and consequently cannot be used as template arguments (§14.3.1/2).

In versions of C++ prior to C++0x, classes declared inside functions cannot appear in template parameters. Your invocation of sort implicitly instantiates it with a template parameter set to InlinePredicate, which is illegal.

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