auto

I get warning signed/unsigned mismatch for the following code: auto n = a.size(); for (auto i = 0; i < n; i++) { } The problem is that by assigning 0 to i it becomes int rather than size_t . So what is better: size_t n = a.size(); for (size_t i = 0; i < n; i++) { } or this: auto n = a.size(); for (size_t i = 0; i < n; i++) { } or maybe you have a better solution? I like the first one more because it is bit more consistent, it just uses size_t rather than both size_t and auto for the same purpose. A range based loop could be a cleaner solution: for (const auto& i : a) { } Here, i is a const

目录 引言 构建示例 match operator 参数 analyzer lenient 参数 Fuzziness fuzzniess 参数 什么是模糊搜索？ Levenshtein Edit Distance fuzziness 参数取值规则 prefix_length Zero terms Query Cutoff frequency synonyms 小结 参考文档 系列文章列表 Query DSL Java Rest Client API 引言 昨天是感恩节，上幼儿园的女儿在老师的叮嘱下，晚上为我和老婆洗了脚(形式上的^_^)，还给我们每人端了一杯水。看着孩子一天天的长大，懂事，感觉很开心，话说咱们程序员这么辛苦是为了什么？不就是为了老婆，孩子，热炕头，有一个温暖幸福的家庭，再捎带着用代码改变一下世界吗？想到这里，顿时觉得学习，创作博客的劲头也的更足了。哈哈，扯远了，书归正传，今天我们来聊聊 Match Query。 Match Query 是最常用的 Full Text Query 。无论需要查询什么字段， match 查询都应该会是首选的查询方式。它既能处理全文字段，又能处理精确字段。 构建示例 为了能够在后面能深入理解 Match Query 中的各个属性的意义，我们先构建一个 index 示例(有兴趣的同学只要将下面字段粘贴到 sense 中就可以创建)。 PUT

In Scott Meyer's book Effective Modern C++ on page 167 (of the print version), he gives the following example: auto timeFuncInvocation = [](auto&& func, auto&&... params) { // start timer; std::forward<decltype(func)>(func)( std::forward<decltype(params)>(params)... ); // stop timer and record elapsed time; }; I completely understand the perfect forwarding of params , but it is unclear to me when perfect forwarding of func would ever be relevant. In other words, what are the advantages of the above over the following: auto timeFuncInvocation = [](auto&& func, auto&&... params) { // start timer