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IDEA: javac: source release 1.7 requires target release 1.7
...
Most likely you have incorrect compiler options imported from Maven here:
Also check project and module bytecode (target) version settings outlined on the screenshot.
Other places where the source language level is configured:
Project Structur...
Why doesn't println! work in Rust unit tests?
... happens because Rust test programs hide the stdout of successful tests in order for the test output to be tidy. You can disable this behavior by passing the --nocapture option to the test binary or to cargo test:
#[test]
fn test() {
println!("Hidden output")
}
Invoking tests:
% rustc --test ma...
In Objective-C, how do I test the object type?
I need to test whether the object is of type NSString or UIImageView . How can I accomplish this? Is there some type of "isoftype" method?
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How can I print variable and string on same line in Python?
I am using python to work out how many children would be born in 5 years if a child was born every 7 seconds. The problem is on my last line. How do I get a variable to work when I'm printing text either side of it?
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How can I remove an element from a list, with lodash?
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As lyyons pointed out in the comments, more idiomatic and lodashy way to do this would be to use _.remove, like this
_.remove(obj.subTopics, {
subTopicId: stToDelete
});
Apart from that, you can pass a predicate function whose result will be used to determin...
What is the difference between ndarray and array in numpy?
...ng of numpy.ndarray:
Arrays should be constructed using array, zeros or empty ... The parameters given here refer to a
low-level method (ndarray(...)) for instantiating an array.
Most of the meat of the implementation is in C code, here in multiarray, but you can start looking at the ndar...
static function in C
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Is translation unit the correct terminology to use here? Wouldn't object file be more accurate? From what I understand, a static function is hidden from the linker and the linker does not operate on translation units.
– Steven E...
dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output
When using summarise with plyr 's ddply function, empty categories are dropped by default. You can change this behavior by adding .drop = FALSE . However, this doesn't work when using summarise with dplyr . Is there another way to keep empty categories in the result?
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Why does volatile exist?
What does the volatile keyword do? In C++ what problem does it solve?
18 Answers
18
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What is memory fragmentation?
I've heard the term "memory fragmentation" used a few times in the context of C++ dynamic memory allocation. I've found some questions about how to deal with memory fragmentation, but can't find a direct question that deals with it itself. So:
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