比较两个向量的<Structs>字符串元素

接着我之前的问题：

从 void 函数访问局部变量

从那以后，我已经能够获得我需要的数据，现在我正在尝试比较传递给函数的每个struct元素的string name属性。

这是我当前的代码：

#include <string>
#include <vector>
#include <fstream>
#include <sstream>
#include <iostream>
using namespace std;
struct Nutrient {
string name, units;
double amount, calories;
};
struct Recipe {
string title;
double servings;
};
struct Ingredient {
string name, units;
double amount;
};
vector<Nutrient> readNutrients(istream& fin) {
vector<Nutrient> nutrients;
/**ifstream in(input_file.c_str());*/
string line;
while (getline(fin, line)) {
Nutrient n;
int pos = line.find(';');
n.name = line.substr(0, pos);
line = line.substr(pos + 1);
istringstream iss(line);
iss >> n.amount >> n.units >> n.calories;
nutrients.push_back(n);
}
return nutrients;
}
Recipe readRecipe(istream& fin) {
Recipe recipe;
string line;
int lineCount = 0;
while (getline(fin, line)) {
lineCount++;
istringstream iss(line);
if (lineCount == 1) {
iss >> recipe.title;
}
else if (lineCount == 2) {
iss >> recipe.servings;
}
}
return recipe;
}
vector<Ingredient> readIngredients(istream& fin) {
vector<Ingredient> ingredients;
string line;
string title; // Just grabs, doesnt return
double servings; // Just grabs, doesnt return
int lineCount = 0;

while (getline(fin, line)) {
Ingredient g;
lineCount++;
istringstream iss(line);
if (lineCount == 1) {
iss >> title;
}
else if (lineCount == 2) {
iss >> servings;
}
else {
iss >> g.amount >> g.units >> ws;
getline(iss, g.name, 'n');
cout << g.name << "n";
ingredients.push_back(g);
}
}
return ingredients;
}
bool itemsMatch(vector<Nutrient>& nut, vector<Ingredient>& ing) {
int matchCount = 0;
for (int i = 0; i < nut.size(); i++) {
for (int j = 0; j < ing.size(); j++) {
if (nut[i].name == ing[j].name) {
cout << nut[i].name << " matched " << ing[j].name << endl;
cout << "n";
}
else {
cout << nut[i].name << " didnt match " << ing[j].name << endl;
}
}
}
return true;
}
int main(int argc, char** argv) {
vector<Nutrient> nutri;
vector<Ingredient> ingri;
Recipe rec;
bool match;
ifstream finNutr(argv[1]);
ifstream finIngr(argv[2]);
ifstream finReci(argv[2]);
nutri = readNutrients(finNutr);
ingri = readIngredients(finIngr);
rec = readRecipe(finReci);
match = itemsMatch(nutri, ingri);
return 0;
}

bool itemsMatch()是造成麻烦的原因。这是最后一个输出：

graham crackers
milk chocolate
marshmallows
graham crackers didnt match graham crackers
graham crackers didnt match milk chocolate
graham crackers didnt match marshmallows
milk chocolate didnt match graham crackers
milk chocolate didnt match milk chocolate
milk chocolate didnt match marshmallows
cheese, swiss didnt match graham crackers
cheese, swiss didnt match milk chocolate
cheese, swiss didnt match marshmallows
marshmallows didnt match graham crackers
marshmallows didnt match milk chocolate
marshmallows matched marshmallows

可见，有几个字符串确实匹配，但由于某种原因它说它们不匹配，我不确定为什么。

参数 1 内容

graham crackers; 2 squares 59
milk chocolate; 1 bar 235
cheese, swiss; 1 oz 108
marshmallows; 1 cup 159

参数2

S'mores
2
4 squares graham crackers
1 bar milk chocolate
2 large marshmallows