The QtConcurrent 名称空间提供高级 API 使之可能不使用低级线程原语，编写多线程程序。 更多...
| 头： | #include <QtConcurrent> |
| qmake: | QT += concurrent |
| Since: | Qt 4.4 |
| enum | ReduceOption { UnorderedReduce, OrderedReduce, SequentialReduce } |
| flags | ReduceOptions |
| void | blockingFilter (Sequence & sequence , FilterFunction filterFunction ) |
| Sequence | blockingFiltered (const Sequence & sequence , FilterFunction filterFunction ) |
| Sequence | blockingFiltered (ConstIterator begin , ConstIterator end , FilterFunction filterFunction ) |
| T | blockingFilteredReduced (const Sequence & sequence , FilterFunction filterFunction , ReduceFunction reduceFunction , QtConcurrent::ReduceOptions reduceOptions = UnorderedReduce | SequentialReduce) |
| T | blockingFilteredReduced (ConstIterator begin , ConstIterator end , FilterFunction filterFunction , ReduceFunction reduceFunction , QtConcurrent::ReduceOptions reduceOptions = UnorderedReduce | SequentialReduce) |
| void | blockingMap (Sequence & sequence , MapFunction function ) |
| void | blockingMap (Iterator begin , Iterator end , MapFunction function ) |
| T | blockingMapped (const Sequence & sequence , MapFunction function ) |
| T | blockingMapped (ConstIterator begin , ConstIterator end , MapFunction function ) |
| T | blockingMappedReduced (const Sequence & sequence , MapFunction mapFunction , ReduceFunction reduceFunction , QtConcurrent::ReduceOptions reduceOptions = UnorderedReduce | SequentialReduce) |
| T | blockingMappedReduced (ConstIterator begin , ConstIterator end , MapFunction mapFunction , ReduceFunction reduceFunction , QtConcurrent::ReduceOptions reduceOptions = UnorderedReduce | SequentialReduce) |
| QFuture<void> | filter (Sequence & sequence , FilterFunction filterFunction ) |
| QFuture<T> | filtered (const Sequence & sequence , FilterFunction filterFunction ) |
| QFuture<T> | filtered (ConstIterator begin , ConstIterator end , FilterFunction filterFunction ) |
| QFuture<T> | filteredReduced (const Sequence & sequence , FilterFunction filterFunction , ReduceFunction reduceFunction , QtConcurrent::ReduceOptions reduceOptions = UnorderedReduce | SequentialReduce) |
| QFuture<T> | filteredReduced (ConstIterator begin , ConstIterator end , FilterFunction filterFunction , ReduceFunction reduceFunction , QtConcurrent::ReduceOptions reduceOptions = UnorderedReduce | SequentialReduce) |
| QFuture<void> | map (Sequence & sequence , MapFunction function ) |
| QFuture<void> | map (Iterator begin , Iterator end , MapFunction function ) |
| QFuture<T> | mapped (const Sequence & sequence , MapFunction function ) |
| QFuture<T> | mapped (ConstIterator begin , ConstIterator end , MapFunction function ) |
| QFuture<T> | mappedReduced (const Sequence & sequence , MapFunction mapFunction , ReduceFunction reduceFunction , QtConcurrent::ReduceOptions reduceOptions = UnorderedReduce | SequentialReduce) |
| QFuture<T> | mappedReduced (ConstIterator begin , ConstIterator end , MapFunction mapFunction , ReduceFunction reduceFunction , QtConcurrent::ReduceOptions reduceOptions = UnorderedReduce | SequentialReduce) |
| QFuture<T> | run (Function function , ... ) |
| QFuture<T> | run (QThreadPool * pool , Function function , ... ) |
The QtConcurrent 名称空间提供高级 API 使之可能不使用低级线程原语，编写多线程程序。
见 Qt Concurrent 模块文档编制了解可用函数的概述，或见下文了解每个函数的详细信息。
This enum specifies the order of which results from the map or filter function are passed to the reduce function.
| 常量 | 值 | 描述 |
|---|---|---|
QtConcurrent::UnorderedReduce
|
0x1
|
按任意次序履行缩减。 |
QtConcurrent::OrderedReduce
|
0x2
|
Reduction is done in the order of the original sequence. |
QtConcurrent::SequentialReduce
|
0x4
|
Reduction is done sequentially: only one thread will enter the reduce function at a time. (Parallel reduction might be supported in a future version of Qt Concurrent.) |
The ReduceOptions type is a typedef for QFlags <ReduceOption>. It stores an OR combination of ReduceOption values.
调用
filterFunction
once for each item in
sequence
。若
filterFunction
返回
true
, the item is kept in
sequence
; otherwise, the item is removed from
sequence
.
注意： 此函数将阻塞，直到已处理所有序列项。
另请参阅 并发过滤和过滤缩减 .
调用
filterFunction
once for each item in
sequence
and returns a new Sequence of kept items. If
filterFunction
返回
true
, a copy of the item is put in the new Sequence. Otherwise, the item will
not
appear in the new Sequence.
注意： 此函数将阻塞，直到已处理所有序列项。
另请参阅 filtered () 和 并发过滤和过滤缩减 .
调用
filterFunction
once for each item from
begin
to
end
and returns a new Sequence of kept items. If
filterFunction
返回
true
, a copy of the item is put in the new Sequence. Otherwise, the item will
not
appear in the new Sequence.
注意： 此函数将阻塞，直到迭代器到达正处理序列的末尾。
另请参阅 filtered () 和 并发过滤和过滤缩减 .
调用
filterFunction
once for each item in
sequence
。若
filterFunction
返回
true
for an item, that item is then passed to
reduceFunction
. In other words, the return value is the result of
reduceFunction
for each item where
filterFunction
返回
true
.
Note that while filterFunction is called concurrently, only one thread at a time will call reduceFunction . The order in which reduceFunction is called is undefined if reduceOptions is QtConcurrent::UnorderedReduce 。若 reduceOptions is QtConcurrent::OrderedReduce , reduceFunction is called in the order of the original sequence.
注意： 此函数将阻塞，直到已处理所有序列项。
另请参阅 filteredReduced () 和 并发过滤和过滤缩减 .
调用
filterFunction
once for each item from
begin
to
end
。若
filterFunction
返回
true
for an item, that item is then passed to
reduceFunction
. In other words, the return value is the result of
reduceFunction
for each item where
filterFunction
返回
true
.
Note that while filterFunction is called concurrently, only one thread at a time will call reduceFunction . The order in which reduceFunction is called is undefined if reduceOptions is QtConcurrent::UnorderedReduce 。若 reduceOptions is QtConcurrent::OrderedReduce ， reduceFunction is called in the order of the original sequence.
注意： 此函数将阻塞，直到迭代器到达正处理序列的末尾。
另请参阅 filteredReduced () 和 并发过滤和过滤缩减 .
调用 function once for each item in sequence 。 function is passed a reference to the item, so that any modifications done to the item will appear in sequence .
注意： 此函数将阻塞，直到已处理所有序列项。
调用 function once for each item from begin to end 。 function is passed a reference to the item, so that any modifications done to the item will appear in the sequence which the iterators belong to.
注意： 此函数将阻塞，直到迭代器到达正处理序列的末尾。
调用 function once for each item in sequence and returns a Sequence containing the results. The type of the results will match the type returned my the MapFunction.
注意： 此函数将阻塞，直到已处理所有序列项。
调用 function once for each item from begin to end and returns a container with the results. Specify the type of container as the a template argument, like this:
QList<int> ints = QtConcurrent::blockingMapped<QList<int> >(beginIterator, endIterator, fn);
注意： 此函数将阻塞，直到迭代器到达正处理序列的末尾。
调用 mapFunction once for each item in sequence . The return value of each mapFunction 会被传递给 reduceFunction .
Note that while mapFunction is called concurrently, only one thread at a time will call reduceFunction . The order in which reduceFunction is called is determined by reduceOptions .
注意： 此函数将阻塞，直到已处理所有序列项。
调用 mapFunction once for each item from begin to end . The return value of each mapFunction 会被传递给 reduceFunction .
Note that while mapFunction is called concurrently, only one thread at a time will call reduceFunction . The order in which reduceFunction is called is undefined.
注意： 此函数将阻塞，直到迭代器到达正处理序列的末尾。
另请参阅 blockingMappedReduced () 和 并发映射和映射缩减 .
调用
filterFunction
once for each item in
sequence
。若
filterFunction
返回
true
, the item is kept in
sequence
; otherwise, the item is removed from
sequence
.
另请参阅 并发过滤和过滤缩减 .
调用
filterFunction
once for each item in
sequence
and returns a new Sequence of kept items. If
filterFunction
返回
true
, a copy of the item is put in the new Sequence. Otherwise, the item will
not
appear in the new Sequence.
另请参阅 并发过滤和过滤缩减 .
调用
filterFunction
once for each item from
begin
to
end
and returns a new Sequence of kept items. If
filterFunction
返回
true
, a copy of the item is put in the new Sequence. Otherwise, the item will
not
appear in the new Sequence.
另请参阅 并发过滤和过滤缩减 .
调用
filterFunction
once for each item in
sequence
。若
filterFunction
返回
true
for an item, that item is then passed to
reduceFunction
. In other words, the return value is the result of
reduceFunction
for each item where
filterFunction
返回
true
.
Note that while filterFunction is called concurrently, only one thread at a time will call reduceFunction . The order in which reduceFunction is called is undefined if reduceOptions is QtConcurrent::UnorderedReduce 。若 reduceOptions is QtConcurrent::OrderedReduce , reduceFunction is called in the order of the original sequence.
另请参阅 并发过滤和过滤缩减 .
调用
filterFunction
once for each item from
begin
to
end
。若
filterFunction
返回
true
for an item, that item is then passed to
reduceFunction
. In other words, the return value is the result of
reduceFunction
for each item where
filterFunction
返回
true
.
Note that while filterFunction is called concurrently, only one thread at a time will call reduceFunction . The order in which reduceFunction is called is undefined if reduceOptions is QtConcurrent::UnorderedReduce 。若 reduceOptions is QtConcurrent::OrderedReduce ， reduceFunction is called in the order of the original sequence.
另请参阅 并发过滤和过滤缩减 .
调用 function once for each item in sequence 。 function is passed a reference to the item, so that any modifications done to the item will appear in sequence .
另请参阅 并发映射和映射缩减 .
调用 function once for each item from begin to end 。 function is passed a reference to the item, so that any modifications done to the item will appear in the sequence which the iterators belong to.
另请参阅 并发映射和映射缩减 .
调用 function once for each item in sequence and returns a future with each mapped item as a result. You can use QFuture::const_iterator or QFutureIterator to iterate through the results.
另请参阅 并发映射和映射缩减 .
调用 function once for each item from begin to end and returns a future with each mapped item as a result. You can use QFuture::const_iterator or QFutureIterator to iterate through the results.
另请参阅 并发映射和映射缩减 .
调用 mapFunction once for each item in sequence . The return value of each mapFunction 会被传递给 reduceFunction .
Note that while mapFunction is called concurrently, only one thread at a time will call reduceFunction . The order in which reduceFunction is called is determined by reduceOptions .
另请参阅 并发映射和映射缩减 .
调用 mapFunction once for each item from begin to end . The return value of each mapFunction 会被传递给 reduceFunction .
Note that while mapFunction is called concurrently, only one thread at a time will call reduceFunction . By default, the order in which reduceFunction is called is undefined.
注意： QtConcurrent::OrderedReduce results in the ordered reduction.
另请参阅 并发映射和映射缩减 .
相当于
QtConcurrent::run(QThreadPool::globalInstance(), function, ...);
运行 function in a separate thread. The thread is taken from the global QThreadPool 。注意， function may not run immediately; function will only be run once a thread becomes available.
T is the same type as the return value of function . Non-void return values can be accessed via the QFuture::result () 函数。
注意， QFuture returned by QtConcurrent::run() does not support canceling, pausing, or progress reporting. The QFuture returned can only be used to query for the running/finished status and the return value of the function.
另请参阅 并发运行 .
运行 function in a separate thread. The thread is taken from the QThreadPool pool 。注意， function may not run immediately; function will only be run once a thread becomes available.
T is the same type as the return value of function . Non-void return values can be accessed via the QFuture::result () 函数。
注意， QFuture returned by QtConcurrent::run() does not support canceling, pausing, or progress reporting. The QFuture returned can only be used to query for the running/finished status and the return value of the function.
该函数在 Qt 5.4 引入。
另请参阅 并发运行 .
