programming ruby the pragmatic programmer apos s guide

... particular instance of the class, and methods that work on those variables Sometimes classes themselves need to have their own states This is where class variables come in Class Variables A class variable ... @lyrics = lyrics end end The "< Song" on the class definition line tells Ruby that a KaraokeSong is a subclass of Song (Not surprisingly, this means that Song is a superclass of KaraokeSong People ... always add methods to an existing class This applies to the classes you write as well as the standard, built-in classes All you have to is open up a class definition for an existing class, and the...

Ngày tải lên: 01/06/2014, 12:34

... everyday DSP applications are discussed: digital filters, neural networks, data compression, audio and image processing, etc As much as possible, these chapters stand on their own, not requiring the ... Be sure to visit the book s website at: www.DSPguide.com The Scientist and Engineer 's Guide to Digital Signal Processing Second Edition by Steven W Smith California Technical Publishing San ... review the entire book to solve a specific problem Support by Analog Devices The Second Edition of this book includes two new chapters on Digital Signal Processors, microprocessors specifically designed...

Ngày tải lên: 13/09/2012, 10:21

... as all the details of using mkfs Only the purpose of the program and as much of its usage as is necessary for the purposes of this manual is described For further information, consult these other ... track on the first disk surface) The first sector is the master boot record (MBR) of the disk; this is the sector that the BIOS reads in and starts when the machine is first booted The master boot ... directory /proc/stat Various statistics about the system, such as the number of page faults since the system was booted /proc/uptime The time the system has been up /proc/version The kernel version Note...

Ngày tải lên: 25/11/2013, 11:07

... ors or omissions You assume the risk and full r responsibility for all your actions, and the publishers will not be held responsible for any loss or damage of any sort, whether consequential, ... to use this book In the pages that follow, virtually every piece of essential infor  ation m is presented graphically In most cases the pictures do, indeed, tell the whole story In some cases though, ... breaks Mom makes conscious diet and lifestyle decisions during the conception and gestation periods For dad, the connection largely begins in the delivery room In other words, when the baby is born,...

Ngày tải lên: 15/01/2014, 12:11

... areas in computer science by the unique type of data it uses: signals In most cases, these signals originate as sensory data from the real world: seismic vibrations, visual images, sound waves, ... of the possible histograms that could be associated with it The key to understanding these concepts rests in the units of the vertical axis As previously described, the vertical axis of the histogram ... using the full data set, all 256k points As can be seen, the larger number of samples results in a much smoother appearance Just as with the mean, the statistical noise (roughness) of the histogram...

Ngày tải lên: 31/03/2014, 22:20

... with the database server and to create other database objects, such as statements and cursors The SQL statement joins the tables customers and orders and returns only those customers whose last ... services and software with others The same holds true for all kinds of web service protocols It s slightly different with databases, because they usually not offer interfaces as clean as message ... Databases Database management systems are one of the oldest and most widely used applications in information technology—they are indispensable to enterprises It s nearly impossible to some serious...

Ngày tải lên: 29/04/2014, 14:42

... snapshots/differences-version-1.rb snapshots/differences-version-2.rb snapshots/differences-version-3.rb snapshots/differences-version-4.rb snapshots/differences-version-5.rb snapshots/differences-version-6.rb snapshots/differences-version-7.rb ... "financial-records.xls\n", "snapshots\n", "snapshots/differences-version1.rb\n", "snapshots/differences-version-2.rb\n", "snapshots/differences-v ersion-3.rb\n", "snapshots/differences-version-4.rb\n", "snapshots/differ ... snapshots snapshots/differences-version-1.rb snapshots/differences-version-2.rb snapshots/differences-version-3.rb snapshots/differences-version-4.rb snapshots/differences-version-5.rb snapshots/differences-version-6.rb...

Ngày tải lên: 29/04/2014, 14:42

... on the screen when it s first shown.11 11 The API documentation for the FXTopWindow class (the base class for FXMainWindow) lists some of the other placement hints that you can pass in to the show( ... Versions The discussion and examples in this book are based on FXRuby 1.6, the current release at the time this book was written Generally speaking, it s in your best interest to use the latest ... comprehensive instructions on installing FXRuby, see the instructions in the FXRuby User s Guide. 5 Installing on Windows If you used the One-Click Installer for Ruby on Windows,6 you should already...

Ngày tải lên: 29/04/2014, 14:42

... Life The Analyst Says The Analyst Means The stock is valued at a reasonable 35 times next year s earnings The company s current-year earnings prospects stink Due to the recent run-up in the stock ... researchers have identified genes they believe are responsible for certain types of hair loss, although a gene therapy cure for baldness is years, if not decades, away Besides genetics, illness, stress, ... you can test the brakes for sponginess and squeaking noises during braking, only a close inspection will tell you for certain if the disc pads or drums are worn Transmission The transmission can...

Ngày tải lên: 03/06/2014, 01:09

Ngày tải lên: 12/06/2014, 11:19

... areas in computer science by the unique type of data it uses: signals In most cases, these signals originate as sensory data from the real world: seismic vibrations, visual images, sound waves, ... of the possible histograms that could be associated with it The key to understanding these concepts rests in the units of the vertical axis As previously described, the vertical axis of the histogram ... using the full data set, all 256k points As can be seen, the larger number of samples results in a much smoother appearance Just as with the mean, the statistical noise (roughness) of the histogram...

Ngày tải lên: 28/06/2014, 06:20

... Diseased sections of code are isolated If a module is sick, it is less likely to spread the symptoms around the rest of the system It is also easier to slice it out and transplant in something new ... How did they get so smart? Aren't they just as focused on details as other programmers? The answer is that they paid attention to what they were doing while they were doing it—and then they tried ... This chapter sets the basis for that philosophy The Cat Ate My Source Code The greatest of all weaknesses is the fear of appearing weak • J B Bossuet, Politics from Holy Writ, 1709 One of the...

Ngày tải lên: 06/07/2014, 01:59

... trademarks or registered trademarks of Sun Microsystems, Inc in the United States and other countries UNIX is a registered trademark in the United States and other countries, exclusively licensed ... GOVERNMENT USE: This specification relates to commercial items, processes, or software Accordingly, use by the United States Government is subject to these terms and conditions, consistent with ... defined by SUN, without subsetting or supersetting; (iii) not add any additional packages, classes, or interfaces to the java.* or javax.* packages or their subpackages; (iv) pass all test suites relating...

Ngày tải lên: 13/08/2014, 08:20

... supports two kinds of fields Each instance of a class has its own copy of the instance fields of the class, whereas all instances of a class share the static fields of the class The JNI provides ... GetStringChars The ReleaseStringChars call is necessary whether GetStringChars has set *isCopy to JNI_TRUE or JNI_FALSE ReleaseStringChars either frees the copy or unpins the instance, depending upon whether ... StaticFieldAccess.si = " + si); } static { System.loadLibrary("StaticFieldAccess"); } } The StaticFieldAccess class contains a static integer field si The StaticFieldAccess.main method creates an object,...

Ngày tải lên: 13/08/2014, 08:20

... (*env)->ReleaseStringChars(env, jstr, cstr); } The first call to ReleaseStringChars is issued when there is a pending exception The native method implementation releases the string resource and returns immediately ... condition leads to duplicated work in multiple threads, it is otherwise harmless The field IDs computed by multiple threads for the same field in the same class will necessarily be the same 54 Simpo PDF ... fid _s stores the precomputed field ID for InstanceFieldAccess .s The static variable is initialized to NULL When the InstanceFieldAccess.accessField method is called for the first time, it computes...

Ngày tải lên: 13/08/2014, 08:20

... threads may access the same objects, the same file descriptors—in short, the same shared resources—at the same time To get the most out of this section, you should be familiar with the concepts of ... vm_args.version = 0x00010001; JNI_GetDefaultJavaVMInitArgs(&vm_args); /* Append USER_CLASSPATH to the default system class path */ sprintf(classpath, " %s% c %s" , vm_args.classpath, PATH_SEPARATOR, USER_CLASSPATH); ... classpath[1024]; vm_args.version = 0x00010001; JNI_GetDefaultJavaVMInitArgs(&vm_args); /* Append USER_CLASSPATH to the default system class path */ sprintf(classpath, " %s% c %s" , vm_args.classpath,...

Ngày tải lên: 13/08/2014, 08:20

... its subclasses Class references correspond to java.lang.Class instances, which represent class types An operation such as GetFieldID, which takes a jclass, is a class operation because it gets ... with instance operations and the association of jclass with class operations are consistent across all JNI functions, so it is easy to remember that class operations are distinct from instance ... Peer Instances 9.5.3 When the user presses a key, the operating system calls the C++ member function key_input::key_pressed This member function responds to events by issuing a callback to the keyPressed...

Ngày tải lên: 13/08/2014, 08:20

... Bootstrap class loader Native libraries associated with system classes java.lang.String and other system classes Class loader L1 Class loader L2 class C { native int f(); } class C { native String ... 166 Simpo PDF Merge FebruarySplit Unregistered Version - http://www.simpopdf.com jni.book Page 167 Thursday, and 21, 2002 4:36 PM JNI TYPES class class class class class class class class class ... garbage collects the class loader associated with the native library Because classes refer to their defining loaders, this implies that the virtual machine has also unloaded the class whose static initializer...

Ngày tải lên: 13/08/2014, 08:20

... function has thrown an exception ClassFormatError: if the class data does not specify a valid class or interface NoClassDefFoundError: if the class data does not specify the named class or interface ... arguments that are to be passed to the method immediately following the methodID argument The CallStaticMethod routine accepts these arguments and passes them to the static method that the programmer ... JavaVMAttachArgs; The version field specifies the version of the JNIEnv interface passed back through the second argument The valid versions accepted by Java SDK release 1.2 are JNI_VERSION_1_1 and JNI_VERSION_1_2...

Ngày tải lên: 13/08/2014, 08:20

... GetSuperclass(JNIEnv *env, jclass clazz); Description Returns the superclass of the given class If clazz represents any class other than the class java.lang.Object, then this function returns a reference ... interface • The first argument refer to a subclass of the second argument • The first argument refers to a class that has the second argument as one of its interfaces • The first and second arguments both ... Values the first class or interface argument the second class or interface argument Returns JNI_TRUE if any of the following is true: • The first and second arguments refer to the same class or...

Ngày tải lên: 13/08/2014, 08:20