BSalunke questions

• How to implement undo/redo functionality into Eclipse FormEditor?
• how to remove a line from a string with large content in C++?
• Why derived class function argument takes value of base class function argument?
• How to get last element in tokenized string in C++ separated by "::"?
• How to kill a running for loop on linux?
• How to add an environment variable in Java? [duplicate]
• Why to use mutex instead of boolean variable for thread synchronization?
• How to know the given shared library is built with debug symbols or not?
• How to append content to stringstream type object?
• How to get first line from String in Ruby?

BSalunke answers