std::vector 에러 없에 binary 로 뽑기

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// 실험용.cpp : This file contains the 'main' function. Program execution begins and ends there. // #include "pch.h" #include <iostream> #include <Windows.h> #include <string> #include <vector> #include <fstream> //무조건 std::vector 는 struct 의 맨 뒤에 있어야함. //std::vector 의 크기는 16 byte. struct AAA { AAA() { 1 == 1; } ~AAA() { 1 == 1; } int a; int b; }; struct BBB { BBB() { 1 == 1; } ~BBB() { 1 == 1; } int a; int b; std::vector<AAA> aaas; }; template<typename T> int GiveTotalByteOfStruct() { return 0; } #define RegisterStructForVectorSize(T, num) template<> int GiveTotalByteOfStruct<T>() { return sizeof(T) - num*16;} RegisterStructForVectorSize(AAA, 0) RegisterStructForVectorSize(BBB, 1) template<typename T> void WriteVector(const std::vector<T>& vector, std::ofstream& fout) { int length = vector.size(); fout.write((char*)&length, sizeof(int)); for (int i = 0; i < length; i++) fout.write((char*)&vector[i], GiveTotalByteOfStruct<T>()); } template<typename T> void ReadVector(std::vector<T>& vector, std::ifstream& fin) { int length; fin.read((char*)&length, sizeof(int)); vector.reserve(length); vector.resize(length); for (int i = 0; i < length; i++) fin.read((char*)&vector[i], GiveTotalByteOfStruct<T>()); } void main() { std::vector<BBB> bbbs; for (int i = 0; i < 3; i++) { BBB bbb; bbb.a = i; bbb.b = i * 2; for (int j = 0; j < 4; j++) { AAA aaa; aaa.a = 1+i; aaa.b = j * 2; bbb.aaas.emplace_back(aaa); } bbbs.emplace_back(bbb); } std::ofstream fout("temp.dat", std::ios::out | std::ios::binary); { WriteVector(bbbs, fout); for (int i = 0; i < bbbs.size(); i++) WriteVector(bbbs[i].aaas, fout); } fout.close(); for (auto& bbb : bbbs) { std::cout << bbb.a << bbb.b << bbb.aaas[0].a << std::endl; } std::cout << "끝났음" << std::endl; bbbs.clear(); bbbs.shrink_to_fit(); std::ifstream fin("temp.dat", std::ios::in | std::ios::binary); { ReadVector(bbbs, fin); for (int i = 0; i < bbbs.size(); i++) { ReadVector(bbbs[i].aaas, fin); } } fin.close(); for(auto& bbb : bbbs) { std::cout << bbb.a << bbb.b << bbb.aaas[0].a << std::endl; } std::cout << "끝났음" << std::endl; return; };

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정확히 말하면 멤버변수 중에 std::vector 가 있는 경우.

이런 애들은 메모리를 덮어 쓰면 안됨.

내부 포인터까지 덮어쓰면, 소멸자호출 할 때 무조건 에러뜸.

이부분을 제외하고 저장한 후, 읽을 때도 그렇게 해야함.

https://stackoverflow.com/questions/14089266/how-to-correctly-write-vector-to-binary-file-in-c

 

how to correctly write vector to binary file in c++?

Thanks to Mats Petersson for the explanation on how to to copy vector to array, it's seems work. Here is the code snipet: #include <iostream> #include <string.h> #include <vector&g...

stackoverflow.com

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