Is there a way to use stl algorithms like find() and find_if() in a container of objects? Ex.:With find() find the element whit name "abc" in a vector of class Alfhabetic.
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2 Answers
You can define a comparing predicate (functor). Here is a generic implementation:
struct AlphabeticNameComp
{
AlphabeticNameComp( const std::string& toCompare)
: toCompare_( toCompare) { }
bool operator()( const Alphabetic& obj) const
{
return toCompare_ == obj.name();
}
private:
const std::string toCompare_;
};
In a vector of Alphabetic elements
std::vector< Alphabetic> vect;
you can run a search like:
std::find_if( vect.begin(), vect.end(), AlphabeticNameComp( "abc"));
Comments
You can define an operator==() for class Alfhabetic that matches only the data member abc
something like that:
bool operator==(const Alfhabetic& a, const Alfhabetic& b)
{
return (a.abc == b.abc);
}
and then finding an Alfhabetic instance initialized with abc as the value you want.
