11/6/2022 0 Comments Spaceplan controlsUnited Launch Alliance, which provided the Atlas V rocket, declared success 1 1/2 hours after liftoff. In March, it hoisted a national security satellite. “If you add up all the missions, just under eight years in orbit and 1 billion miles, so a lot of traveling by this machine," Chilton said during the launch broadcast.ĭelayed a day by bad weather, this marked just the second rocket launch for the newly established Space Force. Since the first flight in 2010, the secretive space planes had logged a combined 2,865 days in orbit as of Sunday. “You could say that the X-37B stands on the shoulders of the space shuttle,” Chilton said. Their home base is a former space shuttle hangar at Kennedy. The Air Force has two of these reusable space planes. Naval Research Laboratory, making it the biggest science load yet for an X-37B. The one just launched features an extra compartment for experiments, including several for NASA and the U.S. The winged spacecraft resembles NASA’s old shuttles, but is just one-quarter the size at 29 feet (9 meters) long. The previous mission lasted a record two years, with a touchdown shrouded in darkness at NASA's Kennedy Space Center last year. But a senior vice president for X-37B developer Boeing, Jim Chilton, noted each mission has been progressively longer. Officials aren't saying how long the spacecraft will remain in orbit this time or the purpose of the mission. It’s the sixth flight of an X-37B, a solar-powered plane that's flown by remote control without a crew. military’s mystery space plane rocketed into orbit again Sunday, this time with an extra load of science experiments. The C++ Standard Library provides us with at least one tool that can help: shared_ptr.The U.S. I'm storing strings in user_data, and don't want them shared #SPACEPLAN CONTROLS MANUAL#As was the case with manual lifetime management, mistakes are likely to result in dangling pointers, double frees, or leaks: some_month.days = some_month.days For example, if your library provides facilities to copy annotations from one week to another, clients must copy the associated data manually. The library cannot copy the object that a void* points at since it doesn’t know that object’s type.Some_() // Oops: hopefully none of these days had Mistakes result in memory leaks: delete some_day.user_data void* doesn’t manage lifetime like a smart pointer would, so clients must manage the lifetime of the associated data manually.How do you best implement this extensibility design requirement?Ī C programmer might add a void* to each appropriate data structure: struct day įoo* some_foo = static_cast(some_day.user_data) You want your calendar to be usable for solving a wide array of problems, so you decide you need a mechanism to associate arbitrary client data with days/weeks/months/years. Say you’re creating a calendar component that you intend to distribute in a library for use by other programmers. #SPACEPLAN CONTROLS SERIES#This article on std::any is the second of a series that examines each of the vocabulary types in turn. MSVC has been shipping implementations of std::optional, std::any, and std::variant since the Visual Studio 2017 release, but we haven’t provided any guidelines on how and when these vocabulary types should be used. Today’s post is by Casey Carter.Ĭ++17 adds several new “vocabulary types” – types intended to be used in the interfaces between components from different sources – to the standard library. The questions can be about anything C++ related: MSVC toolset, the standard language and library, the C++ standards committee,, CppCon, etc. This post is part of a regular series of posts where the C++ product team here at Microsoft and other guests answer questions we have received from customers.
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