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Is there a way to instantiate objects from a string holding their class name?

...td::string, variant_type (*)()> map_type; A boost::variant is like an union. It knows which type is stored in it by looking what object was used for initializing or assigning to it. Have a look at its documentation here. Finally, the use of a raw function pointer is also a bit oldish. Modern C+...
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Error: No default engine was specified and no extension was provided

...plate engine name * - `engines` template engine require() cache * - `root` root path for view lookup * * @param {String} name * @param {Object} options * @api private */ function View(name, options) { options = options || {}; this.name = name; this.root = options.root; var engine...
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Redis 的性能幻想与残酷现实 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...真实性能指标,区分清幻想和现实。我们才能真正考虑好如何合理的利用 Redis 的多功能特性,并有效规避的它的弱项,再给出一些 Redis 的使用建议: -根据数据性质把 Redis 集群分类;我的经验是分三类:cache、buffer 和 db - cache...
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How do I edit /etc/sudoers from a script?

... This is a great answer. The whole subshell should be executed as root, e.g. echo "$USER ALL=NOPASSWD:/usr/bin/rsync" | (sudo su -c 'EDITOR="tee" visudo -f /etc/sudoers.d/rsync'). – simon Aug 19 '15 at 21:58 ...
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Python ElementTree module: How to ignore the namespace of XML files to locate matching element when

...}') if has_namespace: el.tag = postfix # strip all namespaces root = it.root This is based on the discussion here: http://bugs.python.org/issue18304 Update: rpartition instead of partition makes sure you get the tag name in postfix even if there is no namespace. Thus you could conden...
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Using Sinatra for larger projects via multiple files

...rb main.rb views/ layout.haml login.haml main.haml   config.ru root = ::File.dirname(__FILE__) require ::File.join( root, 'app' ) run MyApp.new   app.rb # encoding: utf-8 require 'sinatra' require 'haml' class MyApp < Sinatra::Application enable :sessions configure :producti...
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IE7 Z-Index Layering Issues

... var test = document.createElement('div'), fake = false, root = document.body || (function () { fake = true; return document.documentElement.appendChild(document.createElement('body')); }()); root.appendChild(test); test.style.position = 're...
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Excel RTD(Excel Real-Time Data)实时刷新数据技术 - C/C++ - 清泛网 - 专注C/C++及内核技术

...时行情 上面简单讲解了RTD函数的基本原理,接下来演示如何通过Excel RTD来实现从Google Fiancial API中获取实时行情并刷新数据,Google Financal API,提供了世界各大交易所的实时行情数据,其支持的市场及时效性在其官网上有说明,...
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'Missing contentDescription attribute on image' in XML

... be. Make sure you include xmlns:tools="schemas.android.com/tools" in your root layout. – Sotti Nov 11 '14 at 17:26 th...
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How to list all the files in a commit?

... It should be noted that diff-tree won't work when looking at the root commit. – jbranchaud Mar 6 '13 at 5:52 332 ...