When searching through a vector of custom structs, you may encounter difficulties in isolating and iterating over specific elements. This article explores a solution to this problem using C 's standard library functions.
Problem:
Consider the following struct:
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Creating a vector of these structs:
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You wish to search for a specific monster within the vector based on its id element.
Solution:
To search for an element based on a specific field, use the std::find_if function instead of std::find. std::find_if allows you to specify a predicate function that filters the elements of the vector.
Here are two ways to approach this using std::find_if:
1. Using Boost Libraries:
If you have Boost libraries available, you can use the following code:
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2. Creating a Custom Function Object:
If you don't have Boost, create a custom function object as follows:
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Then use this function object in std::find_if:
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This will iterate through the monsters vector and search for the monster with the specified id. The iterator it returned by std::find_if can then be used to access the found monster.
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