std::pmr::memory_resource::memory_resource -
std::pmr::memory_resource::memory_resource
memory_resource() = default; (1) (since C++17)
(implicitly declared)
memory_resource( const memory_resource& ) = default; (2) (since
C++17)
(implicitly declared)
1) Implicitly declared default constructor.
2) Implicitly declared copy constructor.