六、future<>.valid() 一个future<>只能被get()调用一次,调用之后future<>就处于无效状态,处于无效状态之后,对future<>的任何调用(除析构函数之外)会导致不可预期的行为(详情见后面“细说启动线程”文章) 对于future<>的状态,可以使用valid()来检测,其返回值为bool类型 七、等待和轮询 除了get()之外,
std::future::valid() 检查当前的 std::future 对象是否有效,即释放与某个共享状态相关联。 一个有效的 std::future 对象只能通过 std::async(), std::future::get_future 或者std::packaged_task::get_future 来初始化。 另外由 std::future 默认构造函数创建的 std::future 对象是无效(invalid)的,当然...
C++11标准库增加了获取线程返回值的方法,头文件为<future>,主要包括future、promise、packaged_task、async四个类。 那么,了解一下各个类的构成以及功能。 1future future是一个模板类,它是传输线程返回值(也称为共享状态)的媒介,也可以理解为线程返回的结果就安置在future中。 跟多线程相关的类,大多都有一个特点,...
futurizepasses Python 2 code through all the appropriate fixers to turn it into valid Python 3 code, and then adds__future__andfuturepackage imports so that it also runs under Python 2. For conversions from Python 3 code to Py2/3, use thepasteurizescript instead. This converts Py3-only ...
2c,d). 2. Filled in the gaps to define temperature and salinity anomalies in every possible bin. Each missing bin (zero volume in CESM1) was filled with the weighted mean of its 10 nearest valid neighbours, where the weights are the inverse of the Cartesian distance between indices, ...
In the tropical and subtropical regions, where our constraint is most valid, dangerous heat stress for humans specifically will also be influenced by humidity, which is not considered here. High humidity can lead to deadly conditions when combined with high temperatures and could be a major threat...
As more representative models are used, the ‘in-sample’ result remains valid for lower values of the decision resolution. For a fixed number of representative models, it appears that there is an optimal choice for the decision resolution, which maximizes the out-of-sample estimate of the ...
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A valid description of the Solow residual (i.e. the economic growth not explained by labor or capital) was absent during this time because the black line and red line were tracking together. Between B and C we hit an energy crisis in the 1970s, which we ‘solved’ by both 1) using ...
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