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I would like to install the C++ standard library documentation (following the answers in Download C++ reference) but I do not know which version of library is installed in my Ubuntu.

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2 Answers

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Fire up synaptic and search for libstdc++ and see which version is installed, or run apt-cache search -n libstdc++ to see what versions are known, then you can check which one(s) are installed with apt-cache policy libstdc++-XXXX

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This method won't work if he installed g++ from source – Tachyons Oct 14 '12 at 13:25
@tachyons, then he wouldn't be asking the question ;) – psusi Oct 14 '12 at 13:27
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Simple way to find the version of C++ standard library is 

gcc --version

Hope this helps

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