parallel_invoke¶
[algortihms.parallel_invoke]
Function template that evaluates several functions in parallel.
// Defined in header <oneapi/tbb/parallel_invoke.h>
namespace oneapi {
namespace tbb {
template<typename... Functions>
void parallel_invoke(Functions&&... fs);
} // namespace tbb
} // namespace oneapi
Requirements:
All members of
Functionsparameter pack must meet Function Objects requirements described in the [function.objects] section of the ISO C++ standard.Last member of
Functionsparameter pack may be atask_group_context&type.
Evaluates each member passed to parallel_invoke possibly in parallel. Return values are ignored.
The algorithm can accept a task_group_context object so that the algorithm’s tasks are executed in this context. By default, the algorithm is executed in a bound context of its own.
Example¶
The following example evaluates f(), g(), h(), and bar(1) in parallel.
#include "oneapi/tbb/parallel_invoke.h"
extern void f();
extern void bar(int);
class MyFunctor {
int arg;
public:
MyFunctor(int a) : arg(a) {}
void operator()() const { bar(arg); }
};
void RunFunctionsInParallel() {
MyFunctor g(2);
MyFunctor h(3);
oneapi::tbb::parallel_invoke(f, g, h, []{bar(1);});
}