c++模版函数delete防止隐士类型转换.md 

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struct Person {
    int a = 0;
    operator int&() { return a; }
    operator const int&() const { return a; }
};

template <typename T>
void testFunc(T arg) = delete;

void testFunc(int arg)
{
    printf("called testFunc int\n");
}

int main() {
    
    Person a;
    testFunc(a); //报错
    return 0;
}