Non-conforming C++: the Secrets the Committee Is Hiding From You
summary
Shows concrete nonstandard compiler tricks: GCC case ranges, unnamed struct/union members, omitted-operand conditional (an Elvis-like operator), designated initializers and indexed array initializers, plus flexible array members and label addresses. Demonstrates a placement-new array overhead in the standard that makes placement-array unsafe and why uninitialized_construct_n plus casts are undefined; presents a working GCC extension using a flexible-array member. Replaces interpreter switch with labels as values jump table and reports measured speedups ~15% on a toy VM and up to 41% (≈20% average) in real Lua benchmarks.
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chapters (3)
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