Consider the following code in C++. class string_map { string cached_key; string cached_val; const string complex_lookup(const string key); // body specified elsewhere public: const string operator [] (const string key) { if (key == cached_key) return cached_val; string rtn_val = complex_lookup (key); cached_key = key; cached_val !! %3D rtn_val; %3D return rtn_val; }; Suppose that string_map::operator[] contains the only call to complex_lookup anywhere in the program. Explain why it would be unwise for the programmer to expand that call textually in-line and eliminate the separate function.

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