Monthly Archives: September 2012

template in c++

Posted on September 25, 2012 by Bilbo

C++ templates: Function templates: Class templates: Note that member functions of template class are considered function templates. Thus, the implementation (not the definition in the class) needs to have template attribute. Also note the template tag before the scope resolution … Continue reading →

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Type casting in c++

Posted on September 24, 2012 by Bilbo

Implicit conversion: No need for operator. Automatically performed when a value is copied to a compatible type. Such as short to int, int to float, double to int, etc. Also include constructor or operator conversions. For example, the following conversion … Continue reading →

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typedef in C++

Posted on September 24, 2012 by Bilbo

typedef c++ typedef allows you to create an alias for a data type. typedef [attributes] DataType AliasName; typedef also allows you to define an alias for a function. You must specify the return type of the function and its type(s) … Continue reading →

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Double Hashing

Posted on September 21, 2012 by Bilbo

Apply a second hash function to the key when a collision occurs. The second hash function returns the number of positions from the collision point to insert. Cannot be 0.  A popular second hash function would be: Hash2(key) = R – (key % … Continue reading →

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“memset” in C++

Posted on September 21, 2012 by Bilbo

memset function sets the first num bytes of the block of memory pointed by ptr to the specified value. Note that the value is interpreted as an unsigned char. Function prototype: void * memset (void * ptr, int value, size_t … Continue reading →

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“union” in C++

Posted on September 21, 2012 by Bilbo

union is a user defined type that used the same block of memory for every its list member. All the members are allocated starting at the same location in memory, and thus allows the access to the same data with … Continue reading →

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#include header files with C preprocessor

Posted on September 18, 2012 by Bilbo

The `#include’ command works by directing the C preprocessor to scan the specified file as input before continuing with the rest of the current file. The output from the preprocessor contains the output already generated, followed by the output resulting from the … Continue reading →

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misc quick notes

Posted on September 13, 2012 by Bilbo

JRE: Java runtime environment, consists of JVM (abstract computing machine, have an instruction set that uses memory), Java platform core classes, supporting Java platform libs. JIT: just in time compiler, improvement execution performance, especially for long running, compute-intense programs. If JIT env var … Continue reading →

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Cursor movement in Linux cmd line

Posted on September 12, 2012 by Bilbo

The following keyboard shortcuts may help your cursor to move faster around Linux command line, and hopefully improve productivity :)

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Things must know about Linux

Posted on September 10, 2012 by Bilbo

Linux directory structure: Explanation of Linux directory structure. Install packages on Linux: – Extract the package using tar – Go to extracted folder and do (usually install under /usr/local directory). And then compile and install. Note that the last command … Continue reading →

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