Can I get a pointer to a Span?
1
I have a (ReadOnly)Span<byte> from which I want to decode a string.
Only in .NET Core 2.1 I have the new overload to decode a string from it without needing to copy the bytes:
Encoding.GetString(ReadOnlySpan<byte> bytes);
In .NET Standard 2.0 and .NET 4.6 (which I also want to support), I only have the classic overloads:
Encoding.GetString(byte bytes);
Encoding.GetString(byte* bytes, int byteCount);
The first one requires a copy of the bytes into an array which I want to avoid.
The second requires a byte pointer, so I thought about getting one from my span, like
Encoding.GetString(Unsafe.GetPointer<byte>(span.Slice(100)))
...but I failed finding an actual method for that. I tried void* Unsafe.AsPointer<T>(ref T value), but I cannot pass a span to that, and didn't find another method dealing with pointers (and spans).
Is this possible at all, and if yes, how?
c# .net-standard-2.0 .net-4.6 .net-core-2.1
asked Jan 18 at 14:19
Ray KoopaRay Koopa
2,69722858
add a comment |
1
I have a (ReadOnly)Span<byte> from which I want to decode a string.
Only in .NET Core 2.1 I have the new overload to decode a string from it without needing to copy the bytes:
Encoding.GetString(ReadOnlySpan<byte> bytes);
In .NET Standard 2.0 and .NET 4.6 (which I also want to support), I only have the classic overloads:
Encoding.GetString(byte bytes);
Encoding.GetString(byte* bytes, int byteCount);
The first one requires a copy of the bytes into an array which I want to avoid.
The second requires a byte pointer, so I thought about getting one from my span, like
Encoding.GetString(Unsafe.GetPointer<byte>(span.Slice(100)))
...but I failed finding an actual method for that. I tried void* Unsafe.AsPointer<T>(ref T value), but I cannot pass a span to that, and didn't find another method dealing with pointers (and spans).
Is this possible at all, and if yes, how?
c# .net-standard-2.0 .net-4.6 .net-core-2.1
asked Jan 18 at 14:19
Ray KoopaRay Koopa
2,69722858
1
Enter[ReadOnly]Span<T>.GetPinnableReference(). If using C# 7.3, leveraging this is as simple asfixed (byte* bytes = span)-- this compiles for .NET 4.5.2, at least, I haven't tested if it will also really work (I only have later frameworks installed).
– Jeroen Mostert
Jan 18 at 14:43
In prior C# versions, you can use the return value ofref GetPinnableReference()as the argument toUnsafe.AsPointer. You need at least C# 7.0 to usereflocals.
– Jeroen Mostert
Jan 18 at 14:49
@JeroenMostert This is great, I'm using C# 7.3 and it's working smooth as silk. Do you want to post an answer about it so I can accept it?
– Ray Koopa
Jan 18 at 16:04
With the help of ILSpy, I actually found a more convenient syntax for earlier versions as well. Also not tested, but since the pointers returned are identical I'm going to assume it works.
– Jeroen Mostert
Jan 18 at 16:16
add a comment |
1
1
1
I have a (ReadOnly)Span<byte> from which I want to decode a string.
Only in .NET Core 2.1 I have the new overload to decode a string from it without needing to copy the bytes:
Encoding.GetString(ReadOnlySpan<byte> bytes);
In .NET Standard 2.0 and .NET 4.6 (which I also want to support), I only have the classic overloads:
Encoding.GetString(byte bytes);
Encoding.GetString(byte* bytes, int byteCount);
The first one requires a copy of the bytes into an array which I want to avoid.
The second requires a byte pointer, so I thought about getting one from my span, like
Encoding.GetString(Unsafe.GetPointer<byte>(span.Slice(100)))
...but I failed finding an actual method for that. I tried void* Unsafe.AsPointer<T>(ref T value), but I cannot pass a span to that, and didn't find another method dealing with pointers (and spans).
Is this possible at all, and if yes, how?
c# .net-standard-2.0 .net-4.6 .net-core-2.1
asked Jan 18 at 14:19
Ray KoopaRay Koopa
2,69722858
I have a (ReadOnly)Span<byte> from which I want to decode a string.
Only in .NET Core 2.1 I have the new overload to decode a string from it without needing to copy the bytes:
Encoding.GetString(ReadOnlySpan<byte> bytes);
In .NET Standard 2.0 and .NET 4.6 (which I also want to support), I only have the classic overloads:
Encoding.GetString(byte bytes);
Encoding.GetString(byte* bytes, int byteCount);
The first one requires a copy of the bytes into an array which I want to avoid.
The second requires a byte pointer, so I thought about getting one from my span, like
Encoding.GetString(Unsafe.GetPointer<byte>(span.Slice(100)))
...but I failed finding an actual method for that. I tried void* Unsafe.AsPointer<T>(ref T value), but I cannot pass a span to that, and didn't find another method dealing with pointers (and spans).
Is this possible at all, and if yes, how?
c# .net-standard-2.0 .net-4.6 .net-core-2.1
c# .net-standard-2.0 .net-4.6 .net-core-2.1
asked Jan 18 at 14:19
Ray KoopaRay Koopa
2,69722858
asked Jan 18 at 14:19
Ray KoopaRay Koopa
2,69722858
edited Jan 18 at 16:06
Ray Koopa
asked Jan 18 at 14:19
Ray KoopaRay Koopa
2,69722858
asked Jan 18 at 14:19
Ray KoopaRay Koopa
2,69722858
asked Jan 18 at 14:19
Ray KoopaRay Koopa
2,69722858
2,69722858
1
Enter[ReadOnly]Span<T>.GetPinnableReference(). If using C# 7.3, leveraging this is as simple asfixed (byte* bytes = span)-- this compiles for .NET 4.5.2, at least, I haven't tested if it will also really work (I only have later frameworks installed).
– Jeroen Mostert
Jan 18 at 14:43
In prior C# versions, you can use the return value ofref GetPinnableReference()as the argument toUnsafe.AsPointer. You need at least C# 7.0 to usereflocals.
– Jeroen Mostert
Jan 18 at 14:49
@JeroenMostert This is great, I'm using C# 7.3 and it's working smooth as silk. Do you want to post an answer about it so I can accept it?
– Ray Koopa
Jan 18 at 16:04
With the help of ILSpy, I actually found a more convenient syntax for earlier versions as well. Also not tested, but since the pointers returned are identical I'm going to assume it works.
– Jeroen Mostert
Jan 18 at 16:16
add a comment |
1
Enter[ReadOnly]Span<T>.GetPinnableReference(). If using C# 7.3, leveraging this is as simple asfixed (byte* bytes = span)-- this compiles for .NET 4.5.2, at least, I haven't tested if it will also really work (I only have later frameworks installed).
– Jeroen Mostert
Jan 18 at 14:43
In prior C# versions, you can use the return value ofref GetPinnableReference()as the argument toUnsafe.AsPointer. You need at least C# 7.0 to usereflocals.
– Jeroen Mostert
Jan 18 at 14:49
@JeroenMostert This is great, I'm using C# 7.3 and it's working smooth as silk. Do you want to post an answer about it so I can accept it?
– Ray Koopa
Jan 18 at 16:04
With the help of ILSpy, I actually found a more convenient syntax for earlier versions as well. Also not tested, but since the pointers returned are identical I'm going to assume it works.
– Jeroen Mostert
Jan 18 at 16:16
1
1
Enter
[ReadOnly]Span<T>.GetPinnableReference(). If using C# 7.3, leveraging this is as simple as fixed (byte* bytes = span) -- this compiles for .NET 4.5.2, at least, I haven't tested if it will also really work (I only have later frameworks installed).– Jeroen Mostert
Jan 18 at 14:43
Enter
[ReadOnly]Span<T>.GetPinnableReference(). If using C# 7.3, leveraging this is as simple as fixed (byte* bytes = span) -- this compiles for .NET 4.5.2, at least, I haven't tested if it will also really work (I only have later frameworks installed).– Jeroen Mostert
Jan 18 at 14:43
In prior C# versions, you can use the return value of
ref GetPinnableReference() as the argument to Unsafe.AsPointer. You need at least C# 7.0 to use ref locals.– Jeroen Mostert
Jan 18 at 14:49
In prior C# versions, you can use the return value of
ref GetPinnableReference() as the argument to Unsafe.AsPointer. You need at least C# 7.0 to use ref locals.– Jeroen Mostert
Jan 18 at 14:49
@JeroenMostert This is great, I'm using C# 7.3 and it's working smooth as silk. Do you want to post an answer about it so I can accept it?
– Ray Koopa
Jan 18 at 16:04
@JeroenMostert This is great, I'm using C# 7.3 and it's working smooth as silk. Do you want to post an answer about it so I can accept it?
– Ray Koopa
Jan 18 at 16:04
With the help of ILSpy, I actually found a more convenient syntax for earlier versions as well. Also not tested, but since the pointers returned are identical I'm going to assume it works.
– Jeroen Mostert
Jan 18 at 16:16
With the help of ILSpy, I actually found a more convenient syntax for earlier versions as well. Also not tested, but since the pointers returned are identical I'm going to assume it works.
– Jeroen Mostert
Jan 18 at 16:16
add a comment |
2 Answers
2
active
oldest
votes
3
If you have C# 7.3 or later, you can use the extension made to the fixed statement that can use any appropriate GetPinnableReference method on a type (which Span and ReadOnlySpan have):
fixed (byte* bp = bytes) {
...
}
As we're dealing with pointers this requires an unsafe context, of course.
C# 7.0 through 7.2 don't have this, but allow the following:
fixed (byte* bp = &bytes.GetPinnableReference()) {
...
}
answered Jan 18 at 16:15
Jeroen MostertJeroen Mostert
17.4k2252
Pretty cool. I accept this as an answer as it also covers new C# 7.3 syntax.
– Ray Koopa
Jan 18 at 16:18
add a comment |
2
Try this:
Span<byte> bytes = ...;
string s = Encoding.UTF8.GetString((byte*)Unsafe.AsPointer(ref bytes.GetPinnableReference()),
bytes.Length);
answered Jan 18 at 14:52
mm8mm8
82.9k81831
Thanks! I did not seeGetPinnableReference()anywhere in IntelliSense. However, this did not seem to work forReadOnlySpan<byte>(it cannot pass it as ref because it is readonly); but it would work for my initial question (only now I realized I have aReadOnlySpan, sorry!).
– Ray Koopa
Jan 18 at 16:00
@RayKoopa: the reason you couldn't see the method, by the way, is because it was explicitly hidden as feature. This was back when it was calledDangerousGetPinnableReference; it's since been downgraded to "not actually that dangerous", but the method's still hidden.
– Jeroen Mostert
Jan 18 at 16:21
1
The alternative proposed forReadOnlySpanis not correct! Storing it in a variable first and taking therefof that gives you a reference to the localbyte, not the spanned array. Accessing any element beyond the first this way will give garbage.
– Jeroen Mostert
Jan 18 at 16:25
@JeroenMostert I actually remember that "Dangerous" method name. I didn't follow up on the recent changes, thanks for clearing this up.
– Ray Koopa
Jan 18 at 16:28
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
3
If you have C# 7.3 or later, you can use the extension made to the fixed statement that can use any appropriate GetPinnableReference method on a type (which Span and ReadOnlySpan have):
fixed (byte* bp = bytes) {
...
}
As we're dealing with pointers this requires an unsafe context, of course.
C# 7.0 through 7.2 don't have this, but allow the following:
fixed (byte* bp = &bytes.GetPinnableReference()) {
...
}
answered Jan 18 at 16:15
Jeroen MostertJeroen Mostert
17.4k2252
Pretty cool. I accept this as an answer as it also covers new C# 7.3 syntax.
– Ray Koopa
Jan 18 at 16:18
add a comment |
3
If you have C# 7.3 or later, you can use the extension made to the fixed statement that can use any appropriate GetPinnableReference method on a type (which Span and ReadOnlySpan have):
fixed (byte* bp = bytes) {
...
}
As we're dealing with pointers this requires an unsafe context, of course.
C# 7.0 through 7.2 don't have this, but allow the following:
fixed (byte* bp = &bytes.GetPinnableReference()) {
...
}
answered Jan 18 at 16:15
Jeroen MostertJeroen Mostert
17.4k2252
Pretty cool. I accept this as an answer as it also covers new C# 7.3 syntax.
– Ray Koopa
Jan 18 at 16:18
add a comment |
3
3
3
If you have C# 7.3 or later, you can use the extension made to the fixed statement that can use any appropriate GetPinnableReference method on a type (which Span and ReadOnlySpan have):
fixed (byte* bp = bytes) {
...
}
As we're dealing with pointers this requires an unsafe context, of course.
C# 7.0 through 7.2 don't have this, but allow the following:
fixed (byte* bp = &bytes.GetPinnableReference()) {
...
}
answered Jan 18 at 16:15
Jeroen MostertJeroen Mostert
17.4k2252
If you have C# 7.3 or later, you can use the extension made to the fixed statement that can use any appropriate GetPinnableReference method on a type (which Span and ReadOnlySpan have):
fixed (byte* bp = bytes) {
...
}
As we're dealing with pointers this requires an unsafe context, of course.
C# 7.0 through 7.2 don't have this, but allow the following:
fixed (byte* bp = &bytes.GetPinnableReference()) {
...
}
answered Jan 18 at 16:15
Jeroen MostertJeroen Mostert
17.4k2252
answered Jan 18 at 16:15
Jeroen MostertJeroen Mostert
17.4k2252
answered Jan 18 at 16:15
Jeroen MostertJeroen Mostert
17.4k2252
answered Jan 18 at 16:15
Jeroen MostertJeroen Mostert
17.4k2252
17.4k2252
Pretty cool. I accept this as an answer as it also covers new C# 7.3 syntax.
– Ray Koopa
Jan 18 at 16:18
add a comment |
Pretty cool. I accept this as an answer as it also covers new C# 7.3 syntax.
– Ray Koopa
Jan 18 at 16:18
Pretty cool. I accept this as an answer as it also covers new C# 7.3 syntax.
– Ray Koopa
Jan 18 at 16:18
Pretty cool. I accept this as an answer as it also covers new C# 7.3 syntax.
– Ray Koopa
Jan 18 at 16:18
add a comment |
2
Try this:
Span<byte> bytes = ...;
string s = Encoding.UTF8.GetString((byte*)Unsafe.AsPointer(ref bytes.GetPinnableReference()),
bytes.Length);
answered Jan 18 at 14:52
mm8mm8
82.9k81831
Thanks! I did not seeGetPinnableReference()anywhere in IntelliSense. However, this did not seem to work forReadOnlySpan<byte>(it cannot pass it as ref because it is readonly); but it would work for my initial question (only now I realized I have aReadOnlySpan, sorry!).
– Ray Koopa
Jan 18 at 16:00
@RayKoopa: the reason you couldn't see the method, by the way, is because it was explicitly hidden as feature. This was back when it was calledDangerousGetPinnableReference; it's since been downgraded to "not actually that dangerous", but the method's still hidden.
– Jeroen Mostert
Jan 18 at 16:21
1
The alternative proposed forReadOnlySpanis not correct! Storing it in a variable first and taking therefof that gives you a reference to the localbyte, not the spanned array. Accessing any element beyond the first this way will give garbage.
– Jeroen Mostert
Jan 18 at 16:25
@JeroenMostert I actually remember that "Dangerous" method name. I didn't follow up on the recent changes, thanks for clearing this up.
– Ray Koopa
Jan 18 at 16:28
add a comment |
2
Try this:
Span<byte> bytes = ...;
string s = Encoding.UTF8.GetString((byte*)Unsafe.AsPointer(ref bytes.GetPinnableReference()),
bytes.Length);
answered Jan 18 at 14:52
mm8mm8
82.9k81831
Thanks! I did not seeGetPinnableReference()anywhere in IntelliSense. However, this did not seem to work forReadOnlySpan<byte>(it cannot pass it as ref because it is readonly); but it would work for my initial question (only now I realized I have aReadOnlySpan, sorry!).
– Ray Koopa
Jan 18 at 16:00
@RayKoopa: the reason you couldn't see the method, by the way, is because it was explicitly hidden as feature. This was back when it was calledDangerousGetPinnableReference; it's since been downgraded to "not actually that dangerous", but the method's still hidden.
– Jeroen Mostert
Jan 18 at 16:21
1
The alternative proposed forReadOnlySpanis not correct! Storing it in a variable first and taking therefof that gives you a reference to the localbyte, not the spanned array. Accessing any element beyond the first this way will give garbage.
– Jeroen Mostert
Jan 18 at 16:25
@JeroenMostert I actually remember that "Dangerous" method name. I didn't follow up on the recent changes, thanks for clearing this up.
– Ray Koopa
Jan 18 at 16:28
add a comment |
2
2
2
Try this:
Span<byte> bytes = ...;
string s = Encoding.UTF8.GetString((byte*)Unsafe.AsPointer(ref bytes.GetPinnableReference()),
bytes.Length);
answered Jan 18 at 14:52
mm8mm8
82.9k81831
Try this:
Span<byte> bytes = ...;
string s = Encoding.UTF8.GetString((byte*)Unsafe.AsPointer(ref bytes.GetPinnableReference()),
bytes.Length);
answered Jan 18 at 14:52
mm8mm8
82.9k81831
edited Jan 18 at 15:04
answered Jan 18 at 14:52
mm8mm8
82.9k81831
answered Jan 18 at 14:52
mm8mm8
82.9k81831
answered Jan 18 at 14:52
mm8mm8
82.9k81831
82.9k81831
Thanks! I did not seeGetPinnableReference()anywhere in IntelliSense. However, this did not seem to work forReadOnlySpan<byte>(it cannot pass it as ref because it is readonly); but it would work for my initial question (only now I realized I have aReadOnlySpan, sorry!).
– Ray Koopa
Jan 18 at 16:00
@RayKoopa: the reason you couldn't see the method, by the way, is because it was explicitly hidden as feature. This was back when it was calledDangerousGetPinnableReference; it's since been downgraded to "not actually that dangerous", but the method's still hidden.
– Jeroen Mostert
Jan 18 at 16:21
1
The alternative proposed forReadOnlySpanis not correct! Storing it in a variable first and taking therefof that gives you a reference to the localbyte, not the spanned array. Accessing any element beyond the first this way will give garbage.
– Jeroen Mostert
Jan 18 at 16:25
@JeroenMostert I actually remember that "Dangerous" method name. I didn't follow up on the recent changes, thanks for clearing this up.
– Ray Koopa
Jan 18 at 16:28
add a comment |
Thanks! I did not seeGetPinnableReference()anywhere in IntelliSense. However, this did not seem to work forReadOnlySpan<byte>(it cannot pass it as ref because it is readonly); but it would work for my initial question (only now I realized I have aReadOnlySpan, sorry!).
– Ray Koopa
Jan 18 at 16:00
@RayKoopa: the reason you couldn't see the method, by the way, is because it was explicitly hidden as feature. This was back when it was calledDangerousGetPinnableReference; it's since been downgraded to "not actually that dangerous", but the method's still hidden.
– Jeroen Mostert
Jan 18 at 16:21
1
The alternative proposed forReadOnlySpanis not correct! Storing it in a variable first and taking therefof that gives you a reference to the localbyte, not the spanned array. Accessing any element beyond the first this way will give garbage.
– Jeroen Mostert
Jan 18 at 16:25
@JeroenMostert I actually remember that "Dangerous" method name. I didn't follow up on the recent changes, thanks for clearing this up.
– Ray Koopa
Jan 18 at 16:28
Thanks! I did not see
GetPinnableReference() anywhere in IntelliSense. However, this did not seem to work for ReadOnlySpan<byte> (it cannot pass it as ref because it is readonly); but it would work for my initial question (only now I realized I have a ReadOnlySpan, sorry!).– Ray Koopa
Jan 18 at 16:00
Thanks! I did not see
GetPinnableReference() anywhere in IntelliSense. However, this did not seem to work for ReadOnlySpan<byte> (it cannot pass it as ref because it is readonly); but it would work for my initial question (only now I realized I have a ReadOnlySpan, sorry!).– Ray Koopa
Jan 18 at 16:00
@RayKoopa: the reason you couldn't see the method, by the way, is because it was explicitly hidden as feature. This was back when it was called
DangerousGetPinnableReference; it's since been downgraded to "not actually that dangerous", but the method's still hidden.– Jeroen Mostert
Jan 18 at 16:21
@RayKoopa: the reason you couldn't see the method, by the way, is because it was explicitly hidden as feature. This was back when it was called
DangerousGetPinnableReference; it's since been downgraded to "not actually that dangerous", but the method's still hidden.– Jeroen Mostert
Jan 18 at 16:21
1
1
The alternative proposed for
ReadOnlySpan is not correct! Storing it in a variable first and taking the ref of that gives you a reference to the local byte, not the spanned array. Accessing any element beyond the first this way will give garbage.– Jeroen Mostert
Jan 18 at 16:25
The alternative proposed for
ReadOnlySpan is not correct! Storing it in a variable first and taking the ref of that gives you a reference to the local byte, not the spanned array. Accessing any element beyond the first this way will give garbage.– Jeroen Mostert
Jan 18 at 16:25
@JeroenMostert I actually remember that "Dangerous" method name. I didn't follow up on the recent changes, thanks for clearing this up.
– Ray Koopa
Jan 18 at 16:28
@JeroenMostert I actually remember that "Dangerous" method name. I didn't follow up on the recent changes, thanks for clearing this up.
– Ray Koopa
Jan 18 at 16:28
add a comment |
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1
Enter
[ReadOnly]Span<T>.GetPinnableReference(). If using C# 7.3, leveraging this is as simple asfixed (byte* bytes = span)-- this compiles for .NET 4.5.2, at least, I haven't tested if it will also really work (I only have later frameworks installed).– Jeroen Mostert
Jan 18 at 14:43
In prior C# versions, you can use the return value of
ref GetPinnableReference()as the argument toUnsafe.AsPointer. You need at least C# 7.0 to usereflocals.– Jeroen Mostert
Jan 18 at 14:49
@JeroenMostert This is great, I'm using C# 7.3 and it's working smooth as silk. Do you want to post an answer about it so I can accept it?
– Ray Koopa
Jan 18 at 16:04
With the help of ILSpy, I actually found a more convenient syntax for earlier versions as well. Also not tested, but since the pointers returned are identical I'm going to assume it works.
– Jeroen Mostert
Jan 18 at 16:16