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auto templatedirect mapping
type deducing type deducing
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template : expr을이용해 ParamType과 T를타입추론한다.
auto : auto가템플릿에서 T의역할을 , 형식지정자(type specifier)가ParamType의역할을한다.같은방식으로 타입추론한다.
auto param = expr;
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conceptional templatetemplate<typename T>
void func_for_x(T param);
func_for_x(27);
template<typename T>
void func_for_cx(const T param);
func_for_cx(27);
template<typename T>
void func_for_rx(const T& param);
func_for_rx(27);
auto로변수 선언auto x = 27;
const auto cx = x;
const auto & rx = x;
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conceptional templatetemplate<typename T>
void func_for_x(T param);
func_for_x(27);
auto로변수 선언auto x = 27;
컴파일러가하는 일auto로변수를선언 -> 각각맞는템플릿을호출 ->
템플릿타입추론 -> 추론한 형식에맞는 initializing expression 호출
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