Using C++14 to mock C functions
summary
Uses C++14 macros and templates to mock C functions at test time, specifically replacing libc-style send(fd,buf,len,flags) with a test lambda or programmable mock; library called preach is header-only, scope-bound (RAII) so replacements last until block exit, and avoids singletons or stringly-typed expectations. Works with real socket signatures, enforces type-safe mocks, supports queued return values and call-count/argument expectations. Requires a simple build-time symbol remap (or compile switch) and the runtime macro implementation; demos show it working.
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