Search a vector of objects by object attribute

c++, gcc, std, stl

Solution

You can use `std::find_if` with a suitable functor. In this example, a C++11 lambda is used:

std::vector<Type> v = ....;
std::string myString = ....;
auto it = find_if(v.begin(), v.end(), [&myString](const Type& obj) {return obj.getName() == myString;})

if (it != v.end())
{
  // found element. it is an iterator to the first matching element.
  // if you really need the index, you can also get it:
  auto index = std::distance(v.begin(), it);
}

If you have no C++11 lambda support, a functor would work:

struct MatchString
{
 MatchString(const std::string& s) : s_(s) {}
 bool operator()(const Type& obj) const
 {
   return obj.getName() == s_;
 }
 private:
   const std::string& s_;
};

Here, `MatchString` is a type whose instances are callable with a single `Type` object, and return a boolean. For example,

Type t("Foo"); // assume this means t.getName() is "Foo"
MatchString m("Foo");
bool b = m(t); // b is true

then you can pass an instance to `std::find`

std::vector<Type>::iterator it = find_if(v.begin(), v.end(), MatchString(myString));

Problem

I'm trying to figure out a nice way to find the index of a certain object in a vector - by comparing a string to a member field in the object. Like this: ``` find(vector.begin(), vector.end(), [object where obj.getName() == myString]) ``` I have searched without success - maybe I don't fully understand what to look for.

Original source