整理自 Thinking in C++。
void f(); // int f(); // ERROR
If overloading on return values was permitted, how can the compiler distinguish which call is meant in
int x = f( );? Possibly worse is the difficulty the reader has in knowing which function call is meant. Overloading solely on return value is a bit too subtle, and thus isn’t allowed in C++.
注意 Java 里也是不允许的（虽然我从来没有遇到过需要考虑这个问题的场景）。
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