diff options
Diffstat (limited to 'src/corelib/doc/snippets/code/src_corelib_tools_qmap.cpp')
-rw-r--r-- | src/corelib/doc/snippets/code/src_corelib_tools_qmap.cpp | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/corelib/doc/snippets/code/src_corelib_tools_qmap.cpp b/src/corelib/doc/snippets/code/src_corelib_tools_qmap.cpp index 7580b6bbaf..29e53fc700 100644 --- a/src/corelib/doc/snippets/code/src_corelib_tools_qmap.cpp +++ b/src/corelib/doc/snippets/code/src_corelib_tools_qmap.cpp @@ -311,3 +311,22 @@ while (i != map.end() && i.key() == "plenty") { ++i; } //! [27] + +//! [keyiterator1] +for (QMap<int, QString>::const_iterator it = map.cbegin(), end = map.cend(); it != end; ++it) { + cout << "The key: " << it.key() << endl + cout << "The value: " << it.value() << endl; + cout << "Also the value: " << (*it) << endl; +} +//! [keyiterator1] + +//! [keyiterator2] +// Inefficient, keys() is expensive +QList<int> keys = map.keys(); +int numPrimes = std::count_if(map.cbegin(), map.cend(), isPrimeNumber); +qDeleteAll(map2.keys()); + +// Efficient, no memory allocation needed +int numPrimes = std::count_if(map.keyBegin(), map.keyEnd(), isPrimeNumber); +qDeleteAll(map2.keyBegin(), map2.keyEnd()); +//! [keyiterator2] |