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Replace all the functions! is a cooked quant interview question on language knowledge in Cpp.
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This is a straightforward C++ language knowledge question that probes familiarity with compiler optimisation directives. It asks you to identify the keyword that instructs the compiler to eliminate the overhead of a function call by substituting the function body directly into the calling code.
Understanding this mechanism is fundamental to writing performant C++ in latency-sensitive environments. Quant trading systems often rely on these low-level optimisations to keep inner loops tight. The question rewards precise knowledge of the language rather than deep algorithmic thinking.