Grand central dispatch 调度“U块”创建-“；对'；调度块创建和x27&引用；
我试图在Grand central dispatch 调度“U块”创建-“；对'；调度块创建和x27&引用；,grand-central-dispatch,objective-c++,Grand Central Dispatch,Objective C++,我试图在.mm文件中使用dispatch\u block\u create创建块 dispatch_block_t testBlock = dispatch_block_create(0, ^{ NSLog(@"Hello"); }); dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 1), dispatch_get_main_queue(), testBlock); dispatch_block_cancel(testBlock); X
.mmdispatch_block_t testBlock = dispatch_block_create(0, ^{
NSLog(@"Hello");
});
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 1), dispatch_get_main_queue(), testBlock);
dispatch_block_cancel(testBlock);
#import <dispatch/block.h>
#导入
foo.mm:6:34: error: no matching function for call to 'dispatch_block_create'
dispatch_block_t testBlock = dispatch_block_create(0, ^{
^~~~~~~~~~~~~~~~~~~~~
/usr/include/dispatch/block.h:171:1: note: candidate function not viable: no known conversion from 'int' to 'dispatch_block_flags_t' for 1st argument
dispatch_block_create(dispatch_block_flags_t flags, dispatch_block_t block);
^
1 error generated.
0dispatch\u block\u flags\u tdispatch_block_t testBlock = dispatch_block_create(static_cast<dispatch_block_flags_t>(0), ^{ ... });
dispatch\u block\u t testBlock=dispatch\u block\u create（静态转换（0），^{…}）；