布尔函数的错误答案

我的布尔函数check_gift工作不正常。

我把一个txt文件复制到矢量giftstore中。现在我想检查商店里是否有给定的商品。为了测试函数check_gift，我从实际的txt文件中提取了一个项目，但函数给出了错误的答案。它返回false而不是true。

我做错了什么？

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <cstdlib>
#include <string>
#include <cassert>
using namespace std;
typedef vector<string> Wishes;
int size(Wishes& w){ return static_cast<int>(w.size()); }

struct Wishlist
{
double budget;
Wishes wishes;
};

struct Gift
{
double price;
string name;
};
typedef vector<Gift> Giftstore;
int size(Giftstore& g) { return static_cast<int>(g.size()); }

void read_wishlist_into_struct(ifstream& infile, Wishlist& wishlist)
{
double b;
infile>>b;
wishlist.budget=b;
int i=0;
string name;
getline(infile,name);
while(infile)
{
wishlist.wishes.push_back(name);
i++;
getline(infile,name);
}
infile.close();
}

void show_wishlist(Wishlist wishlist)
{
cout<<"Budget: "<<wishlist.budget<<endl<<endl;
cout<<"Wishes: "<<endl;
for(int i=0; i<size(wishlist.wishes); i++)
{
cout<<wishlist.wishes[i]<<endl;
}
cout<<endl;
}

void read_giftstore_into_vector(ifstream& infile, Gift& gift, Giftstore& giftstore)
{
double p;
string name;
int i=0;
infile>>p;
while(infile)
{
gift.price=p;
getline(infile,name);
gift.name=name;
giftstore.push_back(gift);
i++;
infile>>p;
}
infile.close();
}
void show_giftstore(Giftstore giftstore)
{
cout<<"All possible gifts in giftstore: "<<endl<<endl;
for(int i=0; i<giftstore.size(); i++)
{
cout<<giftstore[i].price<<"t"<<giftstore[i].name<<endl;
}
cout<<endl;
}

bool check_gift(Giftstore giftstore, string giftname)
{
int i=0;
while(i<size(giftstore))
{
if(giftstore[i].name==giftname)
{
cout<<"Yes"<<endl;
return true;
}
else
{
i++;
}
}
return false;
}

void clear(Wishlist& b)
{
b.budget=0;
while(!b.wishes.empty())
{
b.wishes.pop_back();
}
}
void copy(Wishlist a, Wishlist& b)
{
b.budget=a.budget;
for (int i=0; i<size(b.wishes); i++)
{
b.wishes.push_back(a.wishes[i]);
}
}

int main ()
{
ifstream infile2("giftstore.txt");
Gift gift;
Giftstore giftstore;
read_giftstore_into_vector(infile2, gift, giftstore);
show_giftstore(giftstore);
string giftname;
giftname="dvd Up van Pixar";
bool x;
x=check_gift(giftstore, giftname);
cout<<"in store?: "<<x<<endl;
return 0;
}