Thomson Reuters Senior Software Developer interview questions

Initial interview was on the phone for 1/2 hour. Most questions technical, not behavior oriented. Specific c++ features, such as templates and virtual classes. Second interview on site for 3 hours. Most of interview spent at white board coding c++. Some questions were write a function that swapped the characters in a string, and a function that shifted a character in a string by one, I.e. last character now first. Also describe algorithm to search a matrix of numbers sorted on each row, then what is the performance of that algorithm. In all cases interviewer walked through solution and asked for improvements. Last part of interview had design question about adding a feature to a system without modifying existing class due to large amounts of legacy code. Also some behavior questions, like describe most difficult problem and how you solved it. People very nice, casual atmosphere.