44 lines
949 B
C++
44 lines
949 B
C++
// 取反适配器
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#include <iostream>
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#include <vector>
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#include <algorithm>
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using namespace std;
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// 自定义一个适配器，只需要容器中元素即可。
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class GT5 : public unary_function<int, bool>
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{
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public:
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bool operator()(const int &n) const
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{
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return n > 5;
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}
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};
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class GTN : public binary_function<int, int, bool>
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{
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public:
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bool operator()(const int &n1, const int &n2) const
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{
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return n1 > n2;
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}
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};
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int main()
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{
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int m[] = {1, 2, 2, 3, 5, 10};
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vector<int> v;
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v.assign(m, m + sizeof(m) / sizeof(m[0]));
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// find_if(start, end, _callback) 返回查找到的第一个迭代器的位置
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vector<int>::iterator ret = find_if(v.begin(), v.end(), not1(bind2nd(greater<int>(), 3)));
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cout << *ret << endl;
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ret = find_if(v.begin(), v.end(), GT5());
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cout << *ret << endl;
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ret = find_if(v.begin(), v.end(), bind2nd(GTN(), 3));
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cout << *ret << endl;
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return 0;
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}
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