相关疑难解决方法(0)

这个例子似乎用VC10和gcc编译(虽然我的gcc版本很老).

编辑:R.Martinho Fernandez在gcc 4.7上试过这个并且行为仍然是一样的.

struct Base
{
    operator double() const { return 0.0; }
};

struct foo
{
    foo(const char* c) {}
};

struct Something : public Base
{
    void operator[](const foo& f) {}
};

int main()
{
    Something d;
    d["32"];

    return 0;
}

但克朗抱怨道:

test4.cpp:19:6: error: use of overloaded operator '[]' is ambiguous (with operand types 'Something' and 'const char [3]')
    d["32"]
    ~^~~~~
test4.cpp:13:10: note: candidate function
    void operator[](const foo& f) {}
         ^
test4.cpp:19:6: note: built-in candidate operator[](long, const …