opentracing-cpp
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opentracing
fix: use std::invoke_result instead of std::result_of
std::result_of was deprecated in c++17 and removed in c++20.
This PR configures the project to use c++17 if the compiler supports it and use std::invoke_result instead of std::result_of.
If the compiler doesn't support c++17, the project is configured to fallback to c++11 and still use std::result_of.
