20. Default Function Arguments

Question.5

A library header defines:

// library v1.0 header
void set_timeout(int ms = 100);

An application is compiled against v1.0. Later, the library is updated to v2.0:

// library v2.0 header
void set_timeout(int ms = 200);

The application is not recompiled — only the library binary is replaced. What timeout value does the application use?

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200 — the new library default is used at runtime
100 — default values are bound at compile time; the app still uses the old default
0 — the mismatch causes the default to reset
Undefined — the linker detects the conflict

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