Compile time triggered range check for std::vector

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If I’m not mistaken, this is the usual situation with Visual Studio. With g++, you have to invoke the compiler with -D_GLIBCXX_CONCEPT_CHECKS -D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC. (It’s probable that you don’t need all three, but I use all
three systematically.) With other compilers, check the documentation. The purpose of the undefined behavior in the standard here is precisely to allow this sort of thing.

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