mention std::ptr_fun in the quickref guide
mention std::ptr_fun in the quickref guide

toastedcrumpets/eigen,ritsu1228/eigen,pasuka/eigen,toastedcrumpets/eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,ritsu1228/eigen,pasuka/eigen,toastedcrumpets/eigen,Zefz/eigen,toastedcrumpets/eigen,TSC21/Eigen,ritsu1228/eigen,Zefz/eigen,Zefz/eigen,ritsu1228/eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,TSC21/Eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,TSC21/Eigen,TSC21/Eigen,Zefz/eigen