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How do the likely/unlikely macros in the Linux kernel work and what is their benefit?
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They are hint to the compiler to emit instructions that will cause branch prediction to favour the "likely" side of a jump instruction. This can be a big win, if the prediction is correct it means that the jump instruction is basically...
Android ACTION_IMAGE_CAPTURE Intent
...the small Bitmap image. However, if we putExtra(EXTRA_OUTPUT,...) on the intent before starting it, everything works until you try to hit the "Ok" button in the camera app. The "Ok" button just does nothing. The camera app stays open and nothing locks up. We can cancel out of it, but the file neve...
MySQL一次主从数据不一致的问题解决过程 - 数据库(内核) - 清泛网 - 专注C/...
... NOT NULL, tbl CHAR(64) NOT NULL, chunk INT NOT NULL, chunk_time FLOAT NULL, chunk_index VARCHAR(200) NULL, lower_boundary TEXT NULL, upper_boundary TEXT NULL, this_crc CHAR(40) ...
Google fonts URL break HTML5 Validation on w3.org
...e.g. &amp etc). The user agent is then expected to follow RFC 3987 and convert the IRI to percent encoded UTF-8 before submitting it over HTTP (tools.ietf.org/html/rfc3987).
– Mikko Rantalainen
Oct 23 '17 at 6:30
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Creating a copy of an object in C# [duplicate]
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There is no built-in way. You can have MyClass implement the IClonable interface (but it is sort of deprecated) or just write your own Copy/Clone method. In either case you will have to write some code.
For big objects you could consider Serialization + Deserialization (through a MemoryStream)...
org.hibernate.MappingException: Could not determine type for: java.util.List, at table: College, for
...t field solved this issue:
@Column
@ElementCollection(targetClass=Integer.class)
private List<Integer> countries;
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Difference between getDefaultSharedPreferences and getSharedPreferences
... {
return context.getPackageName() + "_preferences";
}
private static int getDefaultSharedPreferencesMode() {
return Context.MODE_PRIVATE;
}
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Android Preferences: How to load the default values when the user hasn't used the preferences-screen
...rriding the user's settings each time your Activity is created
Take a look into PreferenceManager.setDefaultValues in Android API for further investigation.
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Why do I have to access template base class members through the this pointer?
... compiler must compile the template as soon as it sees it (to some kind of internal parse tree representation), and defer compiling the instantiation until later.
The checks that are performed on the template itself, rather than on particular instantiations of it, require that the compiler be able ...
When do I use fabs and when is it sufficient to use std::abs?
...bs; it's overloaded for all the numerical types.
In C, abs only works on integers, and you need fabs for floating point values. These are available in C++ (along with all of the C library), but there's no need to use them.
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