C++ Standard Library Changes
A number of new features were introduced in the C++11 standard library. Many of these could have been implemented under the old standard, but some rely (to a greater or lesser extent) on new C++11 core features.
A large part of the new libraries was defined in the document C++ Standards Committee's Library Technical Report (called TR1), which was published in 2005. Various full and partial implementations of TR1 are currently available using the namespace std::tr1. For C++11 they were moved to namespace std. However, as TR1 features were brought into the C++11 standard library, they were upgraded where appropriate with C++11 language features that were not available in the initial TR1 version. Also, they may have been enhanced with features that were possible under C++03, but were not part of the original TR1 specification.
The committee intends to create a second technical report (called TR2) now that standardization of C++11 is complete. Library proposals which were not ready in time for C++11 will be put into TR2 or further technical reports.
Read more about this topic: C++11
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