C++ pass array as pointer and increment the pointer to retrieve array data
2021/12/20 12:49:34
本文主要是介绍C++ pass array as pointer and increment the pointer to retrieve array data,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
#include <iostream> #include <uuid/uuid.h> #include <ctime> #include <fstream> #include <sstream> #include <chrono> #include <string.h> using namespace std; void retrieveUuid1(char *uuidValue); char *getTimeNow(); struct BookStruct { int BookId; string BookName; string BookTitle; }; void getStructArrayViaRefPointer6(struct BookStruct *bsP); void retrieveStructArray7(); void displayStructArray8(struct BookStruct *ptr); int main() { retrieveStructArray7(); return 0; } void retrieveStructArray7() { struct BookStruct arr[100]; getStructArrayViaRefPointer6(arr); displayStructArray8(arr); cout << "Finished in retrieveStructArray7() and now is " << getTimeNow() << endl; } void displayStructArray8(struct BookStruct *ptr) { for(int i=0;i<100;i++) { cout<<"Index="<<i<<",Id="<<(ptr+i)->BookId<<",Name="<<(ptr+i)->BookName<<",Title="<<(ptr+i)->BookTitle<<endl; } } void getStructArrayViaRefPointer6(struct BookStruct *bsP) { char *uuidValue=(char*)malloc(40); for (int i = 0; i < 100; i++) { bsP->BookId=i*i*i*i; retrieveUuid1(uuidValue); bsP->BookName=uuidValue; retrieveUuid1(uuidValue); bsP->BookTitle=uuidValue; bsP++; } free(uuidValue); } void retrieveUuid1(char *uuidValue) { uuid_t newUUID; uuid_generate(newUUID); uuid_unparse(newUUID, uuidValue); } char *getTimeNow() { char *dtValue = (char *)malloc(20); time_t rawTime = time(NULL); struct tm tmInfo = *localtime(&rawTime); strftime(dtValue, 20, "%Y%m%d%H%M%S", &tmInfo); return dtValue; }
Compile
g++ -g -std=c++2a -I. h1.cpp -o h1 -luuid
Run ./h1
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