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b1beb11a453c7e4acec7dc6743144b2af3393c76
Added a special version of sp_forward for an outdated version of rvalue references supported by gcc 4.4. The compiler would create a temporary and return an rvalue reference to it in the original code. This resulted in warnings about 'returning reference to temporary'. The added version is similar to std::forward on that compiler, except it doesn't prohibit template argument deduction (which is in line with the original sp_forward).
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