“const&arg”与“t arg”

const T & arg sizeof(T)>sizeof(void*) T arg sizeof(T) <= sizeof(void*)

const T& T arg private

class Demo {
    public: Demo() {} 
    private: Demo(const Demo& t) { } 
};

void foo(Demo t) { }

int main() {
    Demo t;
    foo(t); // error: cannot copy `t`.
    return 0;
}

Move constructors

1. void Transmogrify(Widget& toChange);
   void Increment(int* pToBump);
   

2. double Cube(double value);
   

sizeof(T)

Should all/most setter functions in C++11 be written as function templates accepting universal references?

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boost's call traits

"Want Speed? Use pass by value!"

myFunct(item);

Pass by Reference / Value in C++

const const_cast<>

auto_ptr<>