EOS template function for easily clearing multi_index table

原创已于 2022-02-09 09:18:05 修改 · 236 阅读

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于 2022-02-09 09:16:55 首次发布

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此篇博客介绍了如何使用C++模板实现在multi_index中清空表的操作，通过`clear_table`函数，传入一个多索引表即可自动推导并执行删除操作。无需指定具体类型，只需传递表实例即可。

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You can use the following implementation:

template<uint64_t A, typename B, typename... C> void clear_table(multi_index<A, B, C...>* table) {
    auto it = table->begin();
    while (it != table->end()) {
        it = table->erase(it);
    }
}

A,B,C are template parameters of multi_index, you can look them up in multi_index.hpp. A - is a table name, B - is a struct, stored in table, C - is indices list. You don't need to pass them, you just pass a table and params will be deducted