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How do I analyze a .hprof file?
I have a production server running with the following flag: - XX:+HeapDumpOnOutOfMemoryError
7 Answers
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When to use std::begin and std::end instead of container specific versions [duplicate]
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If you look at, say, the definition of std::begin:
template< class C >
auto begin( C& c ) -> decltype(c.begin());
You see that all it does is reference the begin() anyway. I suppose a decent compiler will make the difference nil, so I gu...
How can I print a circular structure in a JSON-like format?
I have a big object I want to convert to JSON and send. However it has circular structure. I want to toss whatever circular references exist and send whatever can be stringified. How do I do that?
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How do I perform a Perl substitution on a string while keeping the original?
...g using a regular expression and store the value in a different variable, without changing the original?
7 Answers
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What do single quotes do in C++ when used on multiple characters?
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It's a multi-character literal. 1952805748 is 0x74657374, which decomposes as
0x74 -> 't'
0x65 -> 'e'
0x73 -> 's'
0x74 -> 't'
Edit:
C++ standard, §2.14.3/1 - Character literals
(...) An ordinary character liter...
How to make zsh run as a login shell on Mac OS X (in iTerm)?
When zsh is set as a login shell on Mac OS X, when it is started by iTerm, zsh doesn't consider that it's being run as a login shell, although it's started as ‘-zsh’ (‘-’ is put as the first character of arg[0]) which is supposed to mean that it should start as a login shell.
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Java 8: How do I work with exception throwing methods in streams?
...(Supertype exception Exception is only used as example, never try to catch it yourself)
Then you can call it with: as.forEach(this::safeFoo).
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Fastest way to determine if an integer is between two integers (inclusive) with known sets of values
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There's an old trick to do this with only one comparison/branch. Whether it'll really improve speed may be open to question, and even if it does, it's probably too little to notice or care about, but when you're only starting with two comparisons, the chance...
Should I use the datetime or timestamp data type in MySQL?
...ecide between using a UNIX timestamp or a native MySQL datetime field, go with the native format. You can do calculations within MySQL that way
("SELECT DATE_ADD(my_datetime, INTERVAL 1 DAY)") and it is simple to change the format of the value to a UNIX timestamp ("SELECT UNIX_TIMESTAMP(my_datetime...
How to change an application icon programmatically in Android?
Is it possible to change an application icon directly from the program?
I mean, change icon.png in the res\drawable folder.
I would like to let users to change application's icon from the program so next time they would see the previously selected icon in the launcher.
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