Container of fixed dynamic size

Theoretically vector has the properties you need. As you noted, actions that possibly do assignments to the contained type, including especially any sequence modifications (empace_back, push_back, insert etc.) are not supported if the elements are noncopyable and/or nonassignable. So to create a vector of noncopyable elements, you’d have to construct each element during vector construction. … Read more

How can I store objects of differing types in a C++ container?

You could use (or re-implement) boost::any and store instances of boost::any in a container. That would be the safest, since boost::any has probably dealt with much of the edge cases and complexity involved in solving this kind of problem in the general case. If you want to do something quick and dirty, create a structure … Read more

Do STL iterators guarantee validity after collection was changed?

Depends on the container. e.g. if it’s a vector, after modifying the container all iterators can be invalidated. However, if it’s a list, the iterators irrelevant to the modified place will remain valid. A vector’s iterators are invalidated when its memory is reallocated. Additionally, inserting or deleting an element in the middle of a vector … Read more

Update max_map_count for ElasticSearch docker container Mac host

On Docker Toolbox If you are in docker toolbox try the docker client from terminal and then make the configs: docker-machine ssh sudo sysctl -w vm.max_map_count=262144 exit On Docker For Mac: The vm_max_map_count setting must be set within the xhyve virtual machine: $ screen ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/tty If it asks you for a username and passwordLog in … Read more

What is the difference between “container_memory_working_set_bytes” and “container_memory_rss” metric on the container

You are right. I will try to address your questions in more detail. What is the difference between two metrics? container_memory_rss equals to the value of total_rss from /sys/fs/cgroups/memory/memory.status file: // The amount of anonymous and swap cache memory (includes transparent // hugepages). // Units: Bytes. RSS uint64 `json:”rss”` The total amount of anonymous and … Read more

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