Which kind of vector?

Understanding vector type deduction in C++

This is an easy question that tests your familiarity with how C++ deduces vector types under different initialization patterns. It is a foundational check that appears in technical interviews at firms where C++ is the working language, including high-frequency trading shops.

The question requires you to trace through initialization syntax and understand how template argument deduction interacts with constructor overloads. Candidates who can quickly and accurately identify vector instantiations demonstrate a solid grasp of the standard library and avoid bugs that stem from subtle type mismatches.

• Template argument deduction and class templates
• Vector constructor overloads
• Initializer lists vs. direct initialization
• Type inference in modern C++