diff options
Diffstat (limited to 'src/corelib/doc/snippets/code/src_corelib_thread_qfuture.cpp')
-rw-r--r-- | src/corelib/doc/snippets/code/src_corelib_thread_qfuture.cpp | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/corelib/doc/snippets/code/src_corelib_thread_qfuture.cpp b/src/corelib/doc/snippets/code/src_corelib_thread_qfuture.cpp index dfa9b670e7..4fe3f7e99e 100644 --- a/src/corelib/doc/snippets/code/src_corelib_thread_qfuture.cpp +++ b/src/corelib/doc/snippets/code/src_corelib_thread_qfuture.cpp @@ -72,3 +72,30 @@ i.toBack(); while (i.hasPrevious()) qDebug() << i.previous(); //! [2] + +//! [3] +using NetworkReply = std::variant<QByteArray, QNetworkReply::NetworkError>; + +enum class IOError { FailedToRead, FailedToWrite }; +using IOResult = std::variant<QString, IOError>; +//! [3] + +//! [4] +QFuture<IOResult> future = QtConcurrent::run([url] { + ... + return NetworkReply(QNetworkReply::TimeoutError); +}).then([](NetworkReply reply) { + if (auto error = std::get_if<QNetworkReply::NetworkError>(&reply)) + return IOResult(IOError::FailedToRead); + + auto data = std::get_if<QByteArray>(&reply); + // try to write *data and return IOError::FailedToWrite on failure + ... +}); + +auto result = future.result(); +if (auto filePath = std::get_if<QString>(&result)) { + // do something with *filePath +else + // process the error +//! [4] |