__GNU_PBDS::NULL_TYPE(3CXX) - Linux man page online | Library functions
Represents no type, or absence of type, for template tricks.
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Tue Mar 10 2020
__gnu_pbds::null_type(3cxx) __gnu_pbds::null_type(3cxx)
libstdc++ Tue Mar 10 2020 __gnu_pbds::null_type(3cxx)