tmp/tmpupje6psz/{from.md → to.md}
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## Binders <a id="depr.lib.binders">[[depr.lib.binders]]</a>
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The binders `binder1st`, `bind1st`, `binder2nd`, and `bind2nd` are
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deprecated. The function template `bind` ([[func.bind.bind]]) provides
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a better solution.
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### Class template `binder1st` <a id="depr.lib.binder.1st">[[depr.lib.binder.1st]]</a>
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``` cpp
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template <class Fn>
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class binder1st
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: public unary_function<typename Fn::second_argument_type,
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typename Fn::result_type> {
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protected:
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Fn op;
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typename Fn::first_argument_type value;
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public:
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binder1st(const Fn& x,
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const typename Fn::first_argument_type& y);
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typename Fn::result_type
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operator()(const typename Fn::second_argument_type& x) const;
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typename Fn::result_type
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operator()(typename Fn::second_argument_type& x) const;
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};
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```
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The constructor initializes `op` with `x` and `value` with `y`.
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`operator()` returns `op``(value,x)`.
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### `bind1st` <a id="depr.lib.bind.1st">[[depr.lib.bind.1st]]</a>
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``` cpp
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template <class Fn, class T>
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binder1st<Fn> bind1st(const Fn& fn, const T& x);
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```
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*Returns:* `binder1st<Fn>(fn, typename Fn::first_argument_type(x))`.
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### Class template `binder2nd` <a id="depr.lib.binder.2nd">[[depr.lib.binder.2nd]]</a>
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``` cpp
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template <class Fn>
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class binder2nd
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: public unary_function<typename Fn::first_argument_type,
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typename Fn::result_type> {
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protected:
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Fn op;
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typename Fn::second_argument_type value;
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public:
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binder2nd(const Fn& x,
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const typename Fn::second_argument_type& y);
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typename Fn::result_type
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operator()(const typename Fn::first_argument_type& x) const;
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typename Fn::result_type
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operator()(typename Fn::first_argument_type& x) const;
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};
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```
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The constructor initializes `op` with `x` and `value` with `y`.
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`operator()` returns `op``(x,value)`.
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### `bind2nd` <a id="depr.lib.bind.2nd">[[depr.lib.bind.2nd]]</a>
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``` cpp
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template <class Fn, class T>
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binder2nd<Fn> bind2nd(const Fn& op, const T& x);
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```
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*Returns:* `binder2nd<Fn>(op, typename Fn::second_argument_type(x))`.
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``` cpp
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find_if(v.begin(), v.end(), bind2nd(greater<int>(), 5));
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```
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finds the first integer in vector `v` greater than 5;
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``` cpp
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find_if(v.begin(), v.end(), bind1st(greater<int>(), 5));
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```
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finds the first integer in `v` less than 5.
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