Mixing
dispatch_block_create - “No matching function for call to 'dispatch_block_create'”
I am trying to create a block using dispatch_block_create in a .mm file
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);
And Xcode complains:
No matching function for call to 'dispatch_block_create'
I have even tried adding:
#import <dispatch/block.h>
grand-central-dispatch objective-c++
edited Jan 2 at 15:52
rmaddy
245k27324388
asked Jan 2 at 14:27
NeeleshNeelesh
1,98384073
add a comment |
I am trying to create a block using dispatch_block_create in a .mm file
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);
And Xcode complains:
No matching function for call to 'dispatch_block_create'
I have even tried adding:
#import <dispatch/block.h>
grand-central-dispatch objective-c++
edited Jan 2 at 15:52
rmaddy
245k27324388
asked Jan 2 at 14:27
NeeleshNeelesh
1,98384073
It is very strange... do you have the latest XCode version installed? Did you check you include UIKit? I tried your code right now and didn't have any build issue (no extra includes required!) Try to make the usual cleanup: delete all derived data and restart xcode.
– FrizzTheSnail
Jan 2 at 14:47
did you try it on a .mm file? The same works for me on .m file
– Neelesh
Jan 2 at 15:14
add a comment |
I am trying to create a block using dispatch_block_create in a .mm file
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);
And Xcode complains:
No matching function for call to 'dispatch_block_create'
I have even tried adding:
#import <dispatch/block.h>
grand-central-dispatch objective-c++
edited Jan 2 at 15:52
rmaddy
245k27324388
asked Jan 2 at 14:27
NeeleshNeelesh
1,98384073
I am trying to create a block using dispatch_block_create in a .mm file
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);
And Xcode complains:
No matching function for call to 'dispatch_block_create'
I have even tried adding:
#import <dispatch/block.h>
grand-central-dispatch objective-c++
grand-central-dispatch objective-c++
edited Jan 2 at 15:52
rmaddy
245k27324388
asked Jan 2 at 14:27
NeeleshNeelesh
1,98384073
edited Jan 2 at 15:52
rmaddy
245k27324388
asked Jan 2 at 14:27
NeeleshNeelesh
1,98384073
edited Jan 2 at 15:52
rmaddy
245k27324388
edited Jan 2 at 15:52
rmaddy
245k27324388
edited Jan 2 at 15:52
rmaddy
245k27324388
245k27324388
asked Jan 2 at 14:27
NeeleshNeelesh
1,98384073
asked Jan 2 at 14:27
NeeleshNeelesh
1,98384073
asked Jan 2 at 14:27
NeeleshNeelesh
1,98384073
1,98384073
It is very strange... do you have the latest XCode version installed? Did you check you include UIKit? I tried your code right now and didn't have any build issue (no extra includes required!) Try to make the usual cleanup: delete all derived data and restart xcode.
– FrizzTheSnail
Jan 2 at 14:47
did you try it on a .mm file? The same works for me on .m file
– Neelesh
Jan 2 at 15:14
add a comment |
It is very strange... do you have the latest XCode version installed? Did you check you include UIKit? I tried your code right now and didn't have any build issue (no extra includes required!) Try to make the usual cleanup: delete all derived data and restart xcode.
– FrizzTheSnail
Jan 2 at 14:47
did you try it on a .mm file? The same works for me on .m file
– Neelesh
Jan 2 at 15:14
It is very strange... do you have the latest XCode version installed? Did you check you include UIKit? I tried your code right now and didn't have any build issue (no extra includes required!) Try to make the usual cleanup: delete all derived data and restart xcode.
– FrizzTheSnail
Jan 2 at 14:47
It is very strange... do you have the latest XCode version installed? Did you check you include UIKit? I tried your code right now and didn't have any build issue (no extra includes required!) Try to make the usual cleanup: delete all derived data and restart xcode.
– FrizzTheSnail
Jan 2 at 14:47
did you try it on a .mm file? The same works for me on .m file
– Neelesh
Jan 2 at 15:14
did you try it on a .mm file? The same works for me on .m file
– Neelesh
Jan 2 at 15:14
add a comment |
1 Answer
1
active
oldest
votes
You left out a crucial part of the compiler error. I get:
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.
The crucial part is "candidate function not viable: no known conversion from 'int' to 'dispatch_block_flags_t' for 1st argument". It's due to the stricter type checking of (Objective-)C++. You need to explicitly cast 0 to dispatch_block_flags_t:
dispatch_block_t testBlock = dispatch_block_create(static_cast<dispatch_block_flags_t>(0), ^{ ... });
answered Jan 2 at 15:29
Ken ThomasesKen Thomases
71.4k671109
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You left out a crucial part of the compiler error. I get:
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.
The crucial part is "candidate function not viable: no known conversion from 'int' to 'dispatch_block_flags_t' for 1st argument". It's due to the stricter type checking of (Objective-)C++. You need to explicitly cast 0 to dispatch_block_flags_t:
dispatch_block_t testBlock = dispatch_block_create(static_cast<dispatch_block_flags_t>(0), ^{ ... });
answered Jan 2 at 15:29
Ken ThomasesKen Thomases
71.4k671109
add a comment |
You left out a crucial part of the compiler error. I get:
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.
The crucial part is "candidate function not viable: no known conversion from 'int' to 'dispatch_block_flags_t' for 1st argument". It's due to the stricter type checking of (Objective-)C++. You need to explicitly cast 0 to dispatch_block_flags_t:
dispatch_block_t testBlock = dispatch_block_create(static_cast<dispatch_block_flags_t>(0), ^{ ... });
answered Jan 2 at 15:29
Ken ThomasesKen Thomases
71.4k671109
add a comment |
You left out a crucial part of the compiler error. I get:
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.
The crucial part is "candidate function not viable: no known conversion from 'int' to 'dispatch_block_flags_t' for 1st argument". It's due to the stricter type checking of (Objective-)C++. You need to explicitly cast 0 to dispatch_block_flags_t:
dispatch_block_t testBlock = dispatch_block_create(static_cast<dispatch_block_flags_t>(0), ^{ ... });
answered Jan 2 at 15:29
Ken ThomasesKen Thomases
71.4k671109
You left out a crucial part of the compiler error. I get:
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.
The crucial part is "candidate function not viable: no known conversion from 'int' to 'dispatch_block_flags_t' for 1st argument". It's due to the stricter type checking of (Objective-)C++. You need to explicitly cast 0 to dispatch_block_flags_t:
dispatch_block_t testBlock = dispatch_block_create(static_cast<dispatch_block_flags_t>(0), ^{ ... });
answered Jan 2 at 15:29
Ken ThomasesKen Thomases
71.4k671109
answered Jan 2 at 15:29
Ken ThomasesKen Thomases
71.4k671109
answered Jan 2 at 15:29
Ken ThomasesKen Thomases
71.4k671109
answered Jan 2 at 15:29
Ken ThomasesKen Thomases
71.4k671109
71.4k671109
add a comment |
add a comment |
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It is very strange... do you have the latest XCode version installed? Did you check you include UIKit? I tried your code right now and didn't have any build issue (no extra includes required!) Try to make the usual cleanup: delete all derived data and restart xcode.
– FrizzTheSnail
Jan 2 at 14:47
did you try it on a .mm file? The same works for me on .m file
– Neelesh
Jan 2 at 15:14