View Compilation Error

0_0_39371019_27631.cpp
0_0_39371019_27631.cpp(11) : error C2563: 在形参表中不匹配
0_0_39371019_27631.cpp(11) : error C2568: “=”: 无法解析函数重载
        VC2013\INCLUDE\xtgmath.h(110): 可能是“::std::enable_if<std::is_integral<_Ty>::value,double>::type sqrt(_Ty)”
        VC2013\INCLUDE\math.h(1251): 或       “long double sqrt(long double) throw()”
        VC2013\INCLUDE\math.h(1135): 或       “float sqrt(float) throw()”
        VC2013\INCLUDE\math.h(521): 或       “double sqrt(double)”
        VC2013\INCLUDE\math.h(521): 或       “double sqrt(double)”
        VC2013\INCLUDE\math.h(1135): 或       “float sqrt(float) throw()”
        VC2013\INCLUDE\math.h(1251): 或       “long double sqrt(long double) throw()”
        VC2013\INCLUDE\xtgmath.h(110): 或       “::std::enable_if<std::is_integral<_Ty>::value,double>::type sqrt(_Ty)”
0_0_39371019_27631.cpp(11) : error C2146: 语法错误: 缺少“;”(在标识符“f”的前面)
0_0_39371019_27631.cpp(11) : error C3861: “f”:  找不到标识符