struct result_of {
typedef T0 type;
};
Ty: 鍙皟鐢ㄧ被鍨嬶紝
-
if Fty is a pointer to function type R(*)(U1, U2, ..., UN) the return type is R; -
濡傛灉Fty鏄釜R(*)(U1, U2, ..., UN) 鍑芥暟鎸囬拡錛岄偅涔堣繑鍥炵被鍨嬫槸R
-
if Fty is a reference to function type R(&)(U1, U2, ..., UN) the return type is R; -
濡傛灉Fty鏄釜R(&)(U1, U2, ..., UN) 鍑芥暟鎸囬拡錛岄偅涔堣繑鍥炵被鍨嬫槸R
-
if Fty is a pointer to member function type R(U1::*)(U2, ..., UN) the return type is R; -
濡傛灉Fty鏄釜R(U1::*)(U2, ..., UN)鎴愬憳鍑芥暟鎸囬拡錛岄偅涔堣繑鍥炵被鍨嬫槸R
-
if Fty is a pointer to data member type R U1::* the return type is R; -
濡傛灉Fty鏄釜R U1::* 鎴愬憳鍙橀噺鎸囬拡錛岄偅涔堣繑鍥炵被鍨嬫槸R
-
if Fty is a class with a member typedef result_type the return type is Fty::result_type; -
濡傛灉Fty鏄竴涓被騫朵笖鍏朵腑瀹氫箟浜?span class="parameter" xmlns="http://www.w3.org/1999/xhtml">result_type 錛岄偅涔堣繑鍥炵被鍨嬫槸Fty::result_type
-
if N is 0 (that is, Ty is of the form Fty()) the return type is void; -
濡傛灉Fty鍑芥暟涓嶅甫鏈変換浣曠殑鍙傛暟錛岄偅涔堣繑鍥炵被鍨嬫槸void
-
if Fty is a class with a member template named result the return type is Fty::result<T1, T2, ..., TN>::type; -
濡傛灉Fty鏄釜綾誨茍涓旀湁涓垚鍛樻ā鏉挎槸result,閭ｄ箞榪斿洖綾誨瀷鏄疐ty::result<T1, T2, ..., TN>::type
-
in all other cases it is an error. -
鍏跺畠鎯呭喌灝變細(xì)鍑洪敊