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Related to String interning


Related to String interning

By : Suman Chowdhure
Date : November 18 2020, 03:49 PM


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String interning?

String interning?


By : Subbu
Date : March 29 2020, 07:55 AM
hop of those help? The string in s4 is interned. However, when you execute s4 += "m";, you have created a new string that will not be interned as its value is not a string literal but the result of a string concatenation operation. As a result, s3 and s4 are two different string instances in two different memory locations.
For more information on string interning, look here, specifically at the last example. When you do String.Intern(s4), you are indeed interning the string, but you are still not performing a reference equality test between those two interned strings. The String.Intern method returns the interned string, so you would need to do this:
code :
string s1 = "tom";
string s2 = "tom";

Console.Write(object.ReferenceEquals(s2, s1)); //true 

string s3 = "tom";
string s4 = "to";
s4 += "m";

Console.Write(object.ReferenceEquals(s3, s4)); //false

string s5 = String.Intern(s4);

Console.Write(object.ReferenceEquals(s3, s5)); //true
String interning in .Net Framework - What are the benefits and when to use interning

String interning in .Net Framework - What are the benefits and when to use interning


By : user3743015
Date : March 29 2020, 07:55 AM
will be helpful for those in need Interning is an internal implementation detail. Unlike boxing, I do not think there is any benefit in knowing more than what you have read in Richter's book.
Micro-optimisation benefits of interning strings manually are minimal hence is generally not recommended.
code :
class Program
{
    const string SomeString = "Some String"; // gets interned

    static void Main(string[] args)
    {
        var s1 = SomeString; // use interned string
        var s2 = SomeString; // use interned string
        var s = "String";
        var s3 = "Some " + s; // no interning 

        Console.WriteLine(s1 == s2); // uses interning comparison
        Console.WriteLine(s1 == s3); // do NOT use interning comparison
    }
}
String Interning

String Interning


By : haz12345
Date : March 29 2020, 07:55 AM
To fix this issue Yes, constant string expressions in the compiler are treated with ldstr, which guarantees interning (via MSDN):
code :
string s = "abc" + "def";
int i = GetValue();
string s = "abc" + i;
char[] chars = {'a','b','c'};
string s = new string(chars);
string t = "abc";
Interning a string

Interning a string


By : sirisha
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Up to JDK 6, Intern'ed strings are stored in the memory pool in a place called the Permanent Generation, which is an area of the JVM that is reserved for non-user objects, like Classes, Methods and other internal JVM objects. The size of this area is limited, and is usually much smaller than the heap.
From JDK 7, interned strings are no longer allocated in the permanent generation of the Java heap, but are instead allocated in the main part of the Java heap (known as the young and old generations), along with the other objects created by the application. This change will result in more data residing in the main Java heap, and less data in the permanent generation, and thus may require heap sizes to be adjusted. Most applications will see only relatively small differences in heap usage due to this change, but larger applications that load many classes or make heavy use of the String.intern() method will see more significant differences.
How can I do string interning in C or C++?

How can I do string interning in C or C++?


By : Johanna Wolf
Date : March 29 2020, 07:55 AM
seems to work fine boost::flyweight< std::string > seems to be exactly what you're looking for.
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