double mv=for_each(coll.begin(),coll.end(),MeanValue()); cout<<"mean value: "<<mv<<endl; } 结果:mean value:4.5 解释:将1 2 3 4 5 6 7 8加起来保存在sum中,num里保存了数字的个数(8),将sum num转换成double型再相除
double mv=for_each(coll.begin(),coll.end(),MeanValue()); cout<<"mean value: "<<mv<<endl; } 结果:mean value:4.5 解释:将1 2 3 4 5 6 7 8加起来保存在sum中,num里保存了数字的个数(8),将sum num转换成double型再相除
27 尽量少做转型动作 四种新式转型const_cast(expression),将对象常量性移除;static_cast(expression),进行强迫隐式类型转换;如non_const到const,int到double;dynamic_cast(expression), 主要进行安全向下转换,速度较慢,用来决定对象是否属于继承体系中某个类型;reinterpret_cast ...
GDB说“程序收到信号sigabrt,中止。0x00000000100404740在__gnu_cxx :: new_allocator :: deallocate(double *,unsigned long)()” 编码上半场左右的函数可能不会被责备,因为他们在更简单的旧版我的神经网络(没有图表)。我打赌它在某处的结构中。 更新:如果我将随机数生成为123而不是基于时间的随机种子,它每次都...
Static_cast c++ operator is a unary operator that compels the conversion of one data type to another. It can do implicit & explicit type conversions routines. Read more!
Static Cast: The simplest cast that can be used is thestatic cast. It is a cast done atcompile time. It can call explicit conversion functions as well as perform implicit type conversions (such asconvertinganintto afloator apointerto avoid*). ...
cast-name可以是:static_cast、const_cast、dynamic_cast、reinterpret_cast一、static_cast二、const_cast三、reinterpret_cast 27 尽量少做转型动作 27 尽量少做转型动作四种新式转型const_cast(expression),将对象常量性移除;static_cast(expression),进行强迫隐式类型转换;如non_const到const,int到double;dynamic_cast...