BloombergLP::bdlcc::Deque::tryPopFront

Synopses

Declared in <bdlcc_deque.h>

Remove up to the specified maxNumItems from the front of this container. Optionally specify a buffer into which the items removed from the container are appended. If buffer is non-null, the removed items are appended to it as if by repeated application of buffer->push_back(popFront()) while the const is not empty and maxNumItems have not yet been removed. Note that *buffer is not cleared -- the popped items are appended after any pre-existing contents.

void
tryPopFront(size_type maxNumItems);

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If this container is non-empty, remove the first item, load that item into the specified *item, and return 0 indicating success. If this container is empty, return a non-zero value with no effect on *item or the state of this container.

int
tryPopFront(TYPE* item);

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Same as the preceding overload, appending removed items to buffer.

void
tryPopFront(
    size_type maxNumItems,
    bsl::vector<TYPE>* buffer);

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Same as the preceding overload, appending removed items to buffer.

void
tryPopFront(
    size_type maxNumItems,
    std::pmr::vector<TYPE>* buffer);

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Same as the preceding overload, appending removed items to buffer.

void
tryPopFront(
    size_type maxNumItems,
    std::vector<TYPE>* buffer);

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