Lightning Talk: Dependency Injection for Modern C++
summary
Argues that taking functions as parameters replaces heavy interface-and-mocking setups and shows concrete code: pass a std::function into an Optimizer/cost function instead of an abstract class, use a lambda injection in production and trivial lambdas in tests, and even swap to a function pointer for extra simplicity. Tests shrink to one-line fakes, complex object state never needs construction, and existing code needs only a few small signature changes to work.
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