Class that serves as a handle to a flow graph of nodes and edges.

// Defined in header <oneapi/tbb/flow_graph.h>

namespace oneapi {
namespace tbb {
namespace flow {

    class graph {
        graph(task_group_context& context);

        void wait_for_all();

        void reset(reset_flags f = rf_reset_protocol);
        void cancel();
        bool is_cancelled();
        bool exception_thrown();

} // namespace flow
} // namespace tbb
} // namespace oneapi

reset_flags enumeration

Member functions

graph(task_group_context &context)

Constructs a graph with no nodes. If context is specified, the graph tasks are executed in this context. By default, the graph is executed in a bound context of its own.


Calls wait_for_all() on the graph, then destroys the graph.

void wait_for_all()

Blocks execution until all tasks associated with the graph have completed or cancelled.

void reset(reset_flags f = rf_reset_protocol)

Resets the graph according to the specified flags. Flags to reset() can be combined with bitwise-or.


reset() is a thread-unsafe operation, don’t call it concurrently.

void cancel()

Cancels all tasks in the graph.

bool is_cancelled()

Returns: true if the graph was cancelled during the last call to wait_for_all(); false, otherwise.

bool exception_thrown()

Returns: true if during the last call to wait_for_all() an exception was thrown; false, otherwise.