The easiest way to create a binder2nd is not to call the constructor explicitly, but instead to use the helper function bind2nd.
Example Finds the first positive number in a list.list<int> L;
...
list<int>::iterator first_positive =
find_if(L.begin(), L.end(), bind2nd(greater<int>(), 0));
assert(first_positive == L.end() || *first_positive > 0);
Definition Defined in the standard header functional, and in the nonstandard backward-compatibility header function.h. Template parameters Parameter Description Default AdaptableBinaryFunction The type of the binary function whose second argument is being bound to a constant. Model ofAdaptable Unary Function Type requirementsAdaptableBinaryFunction must be a model of Adaptable Binary Function. Public base classes
unary_function<AdaptableBinaryFunction::first_argument_type,
AdaptableBinaryFunction::result_type>
Members Member Where defined Description argument_type Adaptable Unary Function The type of the function object's argument, which is AdaptableBinaryFunction::first_argument_type result_type Adaptable Unary Function The type of the result: AdaptableBinaryFunction::result_type
result_type operator()(const argument_type& x) constAdaptable Unary Function Function call. Returns F(x, c), where F and c are the arguments with which this binder1st was constructed.
binder2nd(const AdaptableBinaryFunction& F,
AdaptableBinaryFunction::second_argument_type c)
binder2nd See below
template <class AdaptableBinaryFunction, class T> binder2nd<AdaptableBinaryFunction> bind2nd(const AdaptableBinaryFunction& F, const T& c);binder2nd See below New members These members are not defined in the Adaptable Unary Function requirements, but are specific to binder2nd. Member Description
binder2nd(const AdaptableBinaryFunction& F,
AdaptableBinaryFunction::second_argument_type c)
The constructor. Creates a binder2nd such that calling it with the argument x (where x is of type AdaptableBinaryFunction::first_argument_type) corresponds to the call F(x, c).
template <class AdaptableBinaryFunction, class T> binder2nd<AdaptableBinaryFunction> bind2nd(const AdaptableBinaryFunction& F, const T& c);If F is an object of type AdaptableBinaryFunction, then bind2nd(F, c) is equivalent to binder2nd<AdaptableBinaryFunction>(F, c), but is more convenient. The type T must be convertible to AdaptableBinaryFunction::second_argument_type. This is a global function, not a member function.
[1] Intuitively, you can think of this operation as "binding" the second argument of a binary function to a constant, thus yielding a unary function. This is a special case of a closure.
See also The function object overview, binder1st, Adaptable Unary Function, Adaptable Binary Function STL Main PageRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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