# std::experimental::erase_if (std::vector)

< cpp‎ | experimental

定义于头文件 `<experimental/vector>` |  |
template <class T, class Alloc, class Pred> void erase_if(std::vector<T,Alloc>& c, Pred pred); |  | (库基础 TS v2)

从容器擦除所有满足谓词 `pred` 的元素。等价于 c.erase(std::remove_if(c.begin(), c.end(), pred), c.end());

### 参数

c | - | 要从中擦除的容器
pred | - | 确定该擦除哪些元素的谓词

### 复杂度

线性。

### 示例

    #include <experimental/vector>
    #include <iostream>

    template<typename Os, typename Container>
    inline Os& operator<<(Os& os, Container const& container)
    {
        os << "{ ";
        for (const auto& item : container) {
            os << item << ' ';
        }
        return os << "}";
    }

    int main()
    {
        std::vector<int> data { 3, 3, 4, 5, 5, 6, 6, 7, 2, 1, 0 };

        std::cout << "Original:\n" << data << '\n';

        auto divisible_by_3 = [](auto const& x) { return (x % 3) == 0; };

        std::experimental::erase_if(data, divisible_by_3);

        std::cout << "Erase all items divisible by 3:\n" << data << '\n';
    }

输出：

    Original:
    { 3 3 4 5 5 6 6 7 2 1 0 }
    Erase all items divisible by 3:
    { 4 5 5 7 2 1 }

### 参阅

remove remove_if | 移除满足特定判别标准的元素 (函数模板)
erase(std::vector) (库基础 2 TS) | 从 std::vector 擦除所有等于特定值的元素 (函数模板)