diff options
Diffstat (limited to 'src/concurrent/qtconcurrentmap.cpp')
-rw-r--r-- | src/concurrent/qtconcurrentmap.cpp | 18 |
1 files changed, 3 insertions, 15 deletions
diff --git a/src/concurrent/qtconcurrentmap.cpp b/src/concurrent/qtconcurrentmap.cpp index e6c347b511..884bf4b4f9 100644 --- a/src/concurrent/qtconcurrentmap.cpp +++ b/src/concurrent/qtconcurrentmap.cpp @@ -198,13 +198,11 @@ \snippet code/src_concurrent_qtconcurrentmap.cpp 14 - \section2 Using Bound Function Arguments + \section2 Wrapping Functions that Take Multiple Arguments If you want to use a map function that takes more than one argument you can - use std::bind() to transform it onto a function that takes one argument. If - C++11 support is not available, \l{http://www.boost.org/libs/bind/bind.html} - {boost::bind()} or \l{http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf} - {std::tr1::bind()} are suitable replacements. + use a lambda function or \c std::bind() to transform it onto a function that + takes one argument. As an example, we'll use QImage::scaledToWidth(): @@ -216,16 +214,6 @@ QImage::scaledToWidth() with QtConcurrent::mapped() we have to provide a value for the \e{width} and the \e{transformation mode}: - \snippet code/src_concurrent_qtconcurrentmap.cpp 11 - - The return value from std::bind() is a function object (functor) with - the following signature: - - \snippet code/src_concurrent_qtconcurrentmap.cpp 12 - - This matches what QtConcurrent::mapped() expects, and the complete example - becomes: - \snippet code/src_concurrent_qtconcurrentmap.cpp 13 */ |