各种基本数据类型的长度

#include<iostream>#include<map>using namespace std;class MapSort{public:    bool operator()(int size1,int size2){        return size1<size2;    }};template<typename T>void print(T t){    typename T::const_iterator iter = t.begin();    while(iter!=t.end()){        cout << iter->second << iter->first << endl;        iter++;    }}int main(){    multimap<int,char*,MapSort> sizeMap;    sizeMap.insert(pair<int,char*>(sizeof(unsigned char),"unsigned char:"));    sizeMap.insert(pair<int,char*>(sizeof(char),"char:"));    sizeMap.insert(pair<int,char*>(sizeof(unsigned short),"unsigned short:"));    sizeMap.insert(pair<int,char*>(sizeof(short),"short:"));    sizeMap.insert(pair<int,char*>(sizeof(unsigned int),"unsigned int:"));    sizeMap.insert(pair<int,char*>(sizeof(int),"int:"));    sizeMap.insert(pair<int,char*>(sizeof(float),"float:"));    sizeMap.insert(pair<int,char*>(sizeof(double),"double:"));    sizeMap.insert(pair<int,char*>(sizeof(unsigned long),"unsigned long:"));    sizeMap.insert(pair<int,char*>(sizeof(long),"long:"));    sizeMap.insert(pair<int,char*>(sizeof(long long),"long long:"));    sizeMap.insert(pair<int,char*>(sizeof(string)," string:"));    print(sizeMap);}gcc:unsigned char:1char:1unsigned short:2short:2unsigned int:4int:4float:4unsigned long:4long:4 string:4double:8long long:8vs2008,xp:unsigned char:1char:1unsigned short:2short:2unsigned int:4int:4float:4unsigned long:4long:4double:8long long:8 string:32