C++ interview questions and answers

Views compose lazily and algorithms take ranges directly.

Store a small interface pointer to a templated model holding the callable.

Some types need alignment beyond new's default.

It reports data races and some lock order issues.

Keep hot fields together, avoid polymorphism in inner loops, and batch processing.

You pass stop tokens or framework-specific cancellation into awaitables.

A technique to safely reclaim lock-free nodes readers might still see.

When no synchronization is needed beyond atomicity, like counters.

Preallocate blocks and freelist them for fixed sizes.

Deleters must match allocation method and not hide bugs from ASan.

Profile-guided optimization trains the compiler on real runs then rebuilds.

Single instruction multiple data processes vectors of values.

ThreadSanitizer finds many races in tests.

Allocations needing alignment beyond new’s default, like AVX types.

Named modules export interfaces with fewer textual includes and better isolation.

Reuse buffers, parse views, and arena allocate AST nodes.

Read-copy-update lets readers proceed without locks while writers publish new versions.

Delayed expression trees for lazy evaluation in numeric libraries.

Simplify condition patterns, use data-oriented layouts, and profile with branch counters.

ASan leak detection or Valgrind on tests.