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Draft: Fixes to the C++ code for allowing BL4S/TDAQ to be built with gcc11 against tdaq-9-4-0

Martin Schwinzerl requested to merge mschwinz/TDAQ:fixes/gcc11_tdaq940 into cbeiraod-GreatCodeRestructure

  • fixes ambigious uses of the nlohmann/json library in combination with std::string (mostly by explicitly accessing values via the get< std::string >() method)

  • removes templated generic lambda's -> they are a C++20 feature. Replaced by free-standing template functions; additionally, some changes in the calls to these functions to avoid ADL issues

  • fixes issues with return value handling from network / socket library

  • fixes call to the constructor of a std::pair<> with underspecified template arguments by using the std::make_pair function; using type aliases to remove auto keywords from lambdas (a C++14 feature which we could rely on but did not specifiy anywhere)

  • fixes some cosmetic issues

Edited by Martin Schwinzerl

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