diff options
Diffstat (limited to 'src/corelib/global/qglobal.h')
| -rw-r--r-- | src/corelib/global/qglobal.h | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/src/corelib/global/qglobal.h b/src/corelib/global/qglobal.h index 12ac48f3cb..450c1e586a 100644 --- a/src/corelib/global/qglobal.h +++ b/src/corelib/global/qglobal.h @@ -1102,13 +1102,16 @@ QForeachContainer<typename std::decay<T>::type> qMakeForeachContainer(T &&t) } +#define Q_FOREACH_JOIN(A, B) Q_FOREACH_JOIN_IMPL(A, B) +#define Q_FOREACH_JOIN_IMPL(A, B) A ## B + #if __cplusplus >= 201703L // Use C++17 if statement with initializer. User's code ends up in a else so // scoping of different ifs is not broken -#define Q_FOREACH(variable, container) \ -for (auto _container_ = QtPrivate::qMakeForeachContainer(container); \ - _container_.i != _container_.e; ++_container_.i) \ - if (variable = *_container_.i; false) {} else +#define Q_FOREACH_IMPL(variable, name, container) \ + for (auto name = QtPrivate::qMakeForeachContainer(container); \ + name.i != name.e; ++name.i) \ + if (variable = *name.i; false) {} else #else // Explanation of the control word: // - it's initialized to 1 @@ -1119,12 +1122,15 @@ for (auto _container_ = QtPrivate::qMakeForeachContainer(container); \ // the outer loop to continue executing // - if there was a break inside the inner loop, it will exit with control still // set to 1; in that case, the outer loop will invert it to 0 and will exit too -#define Q_FOREACH(variable, container) \ -for (auto _container_ = QtPrivate::qMakeForeachContainer(container); \ - _container_.control && _container_.i != _container_.e; \ - ++_container_.i, _container_.control ^= 1) \ - for (variable = *_container_.i; _container_.control; _container_.control = 0) +#define Q_FOREACH_IMPL(variable, name, container) \ +for (auto name = QtPrivate::qMakeForeachContainer(container); \ + name.control && name.i != name.e; \ + ++name.i, name.control ^= 1) \ + for (variable = *name.i; name.control; name.control = 0) #endif + +#define Q_FOREACH(variable, container) \ + Q_FOREACH_IMPL(variable, Q_FOREACH_JOIN(_container_, __LINE__), container) #endif // QT_NO_FOREACH #define Q_FOREVER for(;;) |