Queue

#include <gempba/utils/Queue.hpp>  // included automatically via gempba.hpp

Queue<T> is a thread-safe FIFO queue. It wraps std::queue<T> with a std::mutex, making push, pop, and empty-check safe to call from multiple threads concurrently without external synchronization.

Sourced from CTPL by Vitaliy Vitsentiy (Apache 2.0).

Used internally by the thread pool. Not intended for direct use in user code.

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Interface

bool push(const T& value);

Adds value to the back of the queue. Always succeeds; returns true.

bool pop(T& out);

Removes the front element into out. Returns false if the queue is empty, leaving out unchanged.

bool empty();

Returns true if the queue contains no elements.

All three methods lock the internal mutex for their duration.