.template

Understanding C++ template disambiguation in dependent contexts

This is a medium-difficulty C++ language-knowledge question that tests whether you understand how the parser resolves ambiguity in template code. It focuses on a specific syntactic rule that trips up many candidates who have not worked extensively with generic programming or template metaprogramming.

The question asks you to identify the role of a particular keyword in a code snippet where a template member is accessed through a dependent type. This is a common pattern in modern C++ libraries, especially in quantitative finance where high-performance template code is standard. Understanding when and why this keyword is necessary—rather than optional—is essential for writing correct code that compiles reliably across different compilers and compiler settings.

• Dependent names and two-phase lookup
• Parser disambiguation in template contexts
• Template member access through base classes or type parameters