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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...
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) ...
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...
Turning multi-line string into single comma-separated
... to the hold space and after deleting the introduced newline at the start, convert all newlines to ,'s.
N.B. Could be written:
sed 's/\S\+\s\+//;s/\s.*//;1h;1!H;$!d;x;s/\n/,/g' file
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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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Amazon Interview Question: Design an OO parking lot [closed]
... to be either a Handicapped, Regular or Compact. ParkingSpace should be an interface rather.
– name_masked
Dec 11 '10 at 18:22
11
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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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