一些不好的习惯都是用小写，但又没有区分开token，看看代码再说，下面的代码是我在测试polymorphism时写的一部分，怎么也查不出，最后主意到下面红色标志出来的语句，他们（animal）重复了，要区分开来。
重复名的有很多情况，以后遇见再在一起总结，先记录下来。
- #include <iostream>
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#include <cstring>
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#include <string>
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using namespace std;
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enum zoo_obj_kind{
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null = 0,
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#define zk_null (zoo_obj_kind(null))
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no = 0,
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#define zk_no (zoo_obj_kind(no))
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animal = 1,
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#define zk_animal (zoo_obj_kind(animal))
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plant = 2,
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#define zk_plant (zoo_obj_kind(plant))
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others = 3,
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#define zk_others (zoo_obj_kind(others))
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max = 4
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#define zk_max 4
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};
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static const char * zoo_kind_str [zk_max ] ={
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"null",
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"animal",
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"plant",
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"others"
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};
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class obj{
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private:
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char name [40];
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// void *other_msg;
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public:
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obj() {
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strcpy(name,"null") ;
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}
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obj(char *nm){
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strncpy(name,!nm?"null":nm,sizeof(name));
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}
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void say(){
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cout << "name:" << name << endl;
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}
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void say(obj *obj){
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!obj
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? cout << "null\n"
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: cout << "name:" << obj->name << endl;
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}
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};
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class zoo_obj{
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private:
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zoo_obj_kind z_kind;
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char name [40];
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void *other_msg;
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public:
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zoo_obj() {
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z_kind = null;
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strcpy(name,"null") ;
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}
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zoo_obj(char *nm, zoo_obj_kind k){
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strncpy(name,!nm?"null":nm,sizeof(name));
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z_kind = k;
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}
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void say(){
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cout << "name:" << name << ",kind:"
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<< zoo_kind_str[(int) z_kind] << endl;
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}
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void say(zoo_obj *obj){
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!obj
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? cout << "null\n"
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: cout << "name:" << obj->name << endl;
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}
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};
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class animal:public obj{
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private:
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int lags;
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public:
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animal(char *nm, int l) :lags(l), obj(nm){ }
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void say(){
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obj::say();
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cout << "lag:" << lags << endl;
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}
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};
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int main(void){
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zoo_obj obj = zoo_obj( "cat", zoo_obj_kind(animal));
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obj.say();
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class::animal dog ("joel‘s dog",4);
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dog.say();
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}
