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http://gcc.gnu.org/projects/cxx-status.html
GCC has full support for the previous revision of the C++ standard, which was published in 2014. This mode is the default in GCC 6.1 and above; it can be explicitly selected with the -std=c++14 command-line flag, or -std=gnu++14 to enable GNU extensions as well.
http://gcc.gnu.org/gcc-4.3/cxx0x_status.html
GCC provides experimental support for the upcoming ISO C++ standard, C++0x. This support can be enabled with the -std=c++0x or -std=gnu++0x compiler options; the former disables GNU extensions.
http://russ.yanofsky.org/rref/
Much thanks goes to Doug Gregor, without whose efforts, rvalue references would not be a part of GCC right now. He implemented the implicit rvalue cast logic used in return and throw statements, elision of move constructors, and other fixes to get the patch accepted into GCC. Also, Pedro Lamarão assisted with testing and implemented support for the -std=c++0x option.
https://code-examples.net/en/q/1485fb4
That is what some people call universal reference, but really is reference collapsing. In your case, where the argument is an lvalue of type pair<int,shared_ptr<int>> it will not result in the argument being an rvalue reference and it should not move from it.
https://stackoverflow.com/questions/31396415/why-is-lvalue-to-rvalue-reference-binding-allowed-on-g-4-4-6
The rule that prevents rvalue references from binding to lvalues was voted into the standard in March 2009, as the paper N2844, after being first suggested in December 2008, in the paper N2812. Thus, the new rule couldn't possibly be implemented in time for GCC 4.4 (it was in fact implemented for GCC 4.5).
https://software.intel.com/en-us/forums/intel-threading-building-blocks/topic/537522
Dec 22, 2014 · I'm using clang 3.6 from sources and not using libcpp, thus it is false. Also _TBB_GCC_VERSION is 4.2.1, so it is less than 40300. So rvalue reference is actually supported by my compiler, but detected as not supported in tbb_config.h.Author: Altren
http://en.cppreference.com/w/cpp/compiler_support
References. Individual vendor compatibility checklists (these are more up-to-date than the table above) GCC (Updated 2020-01) C++11 core language support status (complete as of 4.8.1, except for n2670, which no compiler implements) C++14 core language support status (complete as of 5.1) C++17 core language support status (complete as of 7.1)
https://stackoverflow.com/questions/17127652/rvalue-and-lvalue-reference-with-lambda-expressions-gcc-vs-msvc
Consider the following code where an lvalue reference is bound to an rvalue (the lambda): gcc (4.8.1) does not accept such code (makes perfect sense). However, Microsoft compiler does accept it meaning that either it is accepting nonstandard code or C++ allows the particular case where an lvalue reference is bound to an rvalue lambda expression.
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