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Solving a test task at one of the interviews.

The main differences from the solutions of other candidates:

In the resolve access to the IP is carried out directly without additional problems from memory, as in the solutions of other candidates like unordered_map<string,shared_ptr<...>> or unordered_map<string,iterator>
Memory reservation in a hash during class initialization.
There is no deallocation, memory allocation when an item is preempted from the cache.
The code reads well enough.
100% test coverage.

Name		Name	Last commit message	Last commit date
Latest commit History 2 Commits
CMakeLists.txt		CMakeLists.txt
CMakeLists.txt.in		CMakeLists.txt.in
DNSCache.cpp		DNSCache.cpp
DNSCache.h		DNSCache.h
DNSCache_shared_mutex.cpp		DNSCache_shared_mutex.cpp
DNSCache_shared_mutex.h		DNSCache_shared_mutex.h
DNSCache_thread_safe.cpp		DNSCache_thread_safe.cpp
DNSCache_thread_safe.h		DNSCache_thread_safe.h
README.md		README.md
Test.cpp		Test.cpp
main.cpp		main.cpp

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