Brady的专栏

#include <stdio.h>#include <stdarg.h>double sum_of_double(int count, ...){ double sum = 0; va_list ap; va_start(ap, count); int i = 0; for (i = 0; i != count; i++) { s

1.基本实现class Singleton{public: static Singleton *Instance() { if (!spInstance) { spInstance = new Singleton; } return spInstance; }protected: