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Is delete *p an alternative to delete [] p?
In what context one may need to dynamically allocate pointers to functions?What are the differences between a pointer variable and a reference variable in C++?PHP: Delete an element from an arrayDeleting array elements in JavaScript - delete vs spliceWhy is “using namespace std” considered bad practice?What is the “-->” operator in C++?What is the copy-and-swap idiom?Why are elementwise additions much faster in separate loops than in a combined loop?Why is reading lines from stdin much slower in C++ than Python?Why is it faster to process a sorted array than an unsorted array?Why should I use a pointer rather than the object itself?
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The following code is from the Microsoft Documentation
int (**p) () = new (int (*[7]) ());
delete *p;
I think that delete [] p should be used here instead.
Is delete *p the same as delete [] p?
c++ arrays
edited Apr 4 at 20:10
Guillaume Racicot
16.2k53872
asked Apr 4 at 20:09
xiaokaoyxiaokaoy
7322719
add a comment |
The following code is from the Microsoft Documentation
int (**p) () = new (int (*[7]) ());
delete *p;
I think that delete [] p should be used here instead.
Is delete *p the same as delete [] p?
c++ arrays
edited Apr 4 at 20:10
Guillaume Racicot
16.2k53872
asked Apr 4 at 20:09
xiaokaoyxiaokaoy
7322719
5
delete *pdiffers fromdelete [] p.
– Jarod42
Apr 4 at 20:10
You're right. They're not the same.
– Cruz Jean
Apr 4 at 20:10
1
typedefwould make thing clearer.
– Jarod42
Apr 4 at 20:10
Anywayp[0]is not initialized. They have typo.
– Jarod42
Apr 4 at 20:14
delete[]what wasnew[]ed anddeletewhat wasnewed. Though in modern code you should avoid most uses ofnew, it's no longer the preferred way of dynamically creating objects. Seestd::make_uniqueandstd::make_sharedinstead or use a standard container.
– François Andrieux
Apr 4 at 20:29
add a comment |
The following code is from the Microsoft Documentation
int (**p) () = new (int (*[7]) ());
delete *p;
I think that delete [] p should be used here instead.
Is delete *p the same as delete [] p?
c++ arrays
edited Apr 4 at 20:10
Guillaume Racicot
16.2k53872
asked Apr 4 at 20:09
xiaokaoyxiaokaoy
7322719
The following code is from the Microsoft Documentation
int (**p) () = new (int (*[7]) ());
delete *p;
I think that delete [] p should be used here instead.
Is delete *p the same as delete [] p?
c++ arrays
c++ arrays
edited Apr 4 at 20:10
Guillaume Racicot
16.2k53872
asked Apr 4 at 20:09
xiaokaoyxiaokaoy
7322719
edited Apr 4 at 20:10
Guillaume Racicot
16.2k53872
asked Apr 4 at 20:09
xiaokaoyxiaokaoy
7322719
edited Apr 4 at 20:10
Guillaume Racicot
16.2k53872
edited Apr 4 at 20:10
Guillaume Racicot
16.2k53872
edited Apr 4 at 20:10
Guillaume Racicot
16.2k53872
16.2k53872
asked Apr 4 at 20:09
xiaokaoyxiaokaoy
7322719
asked Apr 4 at 20:09
xiaokaoyxiaokaoy
7322719
asked Apr 4 at 20:09
xiaokaoyxiaokaoy
7322719
7322719
5
delete *pdiffers fromdelete [] p.
– Jarod42
Apr 4 at 20:10
You're right. They're not the same.
– Cruz Jean
Apr 4 at 20:10
1
typedefwould make thing clearer.
– Jarod42
Apr 4 at 20:10
Anywayp[0]is not initialized. They have typo.
– Jarod42
Apr 4 at 20:14
delete[]what wasnew[]ed anddeletewhat wasnewed. Though in modern code you should avoid most uses ofnew, it's no longer the preferred way of dynamically creating objects. Seestd::make_uniqueandstd::make_sharedinstead or use a standard container.
– François Andrieux
Apr 4 at 20:29
add a comment |
5
delete *pdiffers fromdelete [] p.
– Jarod42
Apr 4 at 20:10
You're right. They're not the same.
– Cruz Jean
Apr 4 at 20:10
1
typedefwould make thing clearer.
– Jarod42
Apr 4 at 20:10
Anywayp[0]is not initialized. They have typo.
– Jarod42
Apr 4 at 20:14
delete[]what wasnew[]ed anddeletewhat wasnewed. Though in modern code you should avoid most uses ofnew, it's no longer the preferred way of dynamically creating objects. Seestd::make_uniqueandstd::make_sharedinstead or use a standard container.
– François Andrieux
Apr 4 at 20:29
5
5
delete *p differs from delete [] p.– Jarod42
Apr 4 at 20:10
delete *p differs from delete [] p.– Jarod42
Apr 4 at 20:10
You're right. They're not the same.
– Cruz Jean
Apr 4 at 20:10
You're right. They're not the same.
– Cruz Jean
Apr 4 at 20:10
1
1
typedef would make thing clearer.– Jarod42
Apr 4 at 20:10
typedef would make thing clearer.– Jarod42
Apr 4 at 20:10
Anyway
p[0] is not initialized. They have typo.– Jarod42
Apr 4 at 20:14
Anyway
p[0] is not initialized. They have typo.– Jarod42
Apr 4 at 20:14
delete[] what was new[]ed and delete what was newed. Though in modern code you should avoid most uses of new, it's no longer the preferred way of dynamically creating objects. See std::make_unique and std::make_shared instead or use a standard container.– François Andrieux
Apr 4 at 20:29
delete[] what was new[]ed and delete what was newed. Though in modern code you should avoid most uses of new, it's no longer the preferred way of dynamically creating objects. See std::make_unique and std::make_shared instead or use a standard container.– François Andrieux
Apr 4 at 20:29
add a comment |
1 Answer
1
active
oldest
votes
That code is invalid C++, because only pointers-to-objects can be deleted. *p has type int (*)(), which is a function pointer, not a pointer to an object.
Even MSVC itself does not compile it, even in permissive mode:
error C2541: 'delete': cannot delete objects that are not pointers
They should have used delete [] instead.
answered Apr 4 at 20:17
AcornAcorn
6,33611441
In what context one may need to dynamically allocate pointers to functions?
– Ayxan
Apr 4 at 20:34
@Ayxan That would be another question, but for instance you may want to have a list of arbitrary operations to execute.
– Acorn
Apr 4 at 20:45
@Ayxan I have quickly posted it here: stackoverflow.com/q/55524710/9305398
– Acorn
Apr 4 at 20:52
1
Even though this is specific to MSVC, g++ gives the following similar error when trying to compile:error: cannot delete expression of type 'int (*)()'.. seems odd that MS would have missed something that simple in their docs :/
– txtechhelp
Apr 4 at 22:04
add a comment |
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1 Answer
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oldest
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
That code is invalid C++, because only pointers-to-objects can be deleted. *p has type int (*)(), which is a function pointer, not a pointer to an object.
Even MSVC itself does not compile it, even in permissive mode:
error C2541: 'delete': cannot delete objects that are not pointers
They should have used delete [] instead.
answered Apr 4 at 20:17
AcornAcorn
6,33611441
In what context one may need to dynamically allocate pointers to functions?
– Ayxan
Apr 4 at 20:34
@Ayxan That would be another question, but for instance you may want to have a list of arbitrary operations to execute.
– Acorn
Apr 4 at 20:45
@Ayxan I have quickly posted it here: stackoverflow.com/q/55524710/9305398
– Acorn
Apr 4 at 20:52
1
Even though this is specific to MSVC, g++ gives the following similar error when trying to compile:error: cannot delete expression of type 'int (*)()'.. seems odd that MS would have missed something that simple in their docs :/
– txtechhelp
Apr 4 at 22:04
add a comment |
That code is invalid C++, because only pointers-to-objects can be deleted. *p has type int (*)(), which is a function pointer, not a pointer to an object.
Even MSVC itself does not compile it, even in permissive mode:
error C2541: 'delete': cannot delete objects that are not pointers
They should have used delete [] instead.
answered Apr 4 at 20:17
AcornAcorn
6,33611441
In what context one may need to dynamically allocate pointers to functions?
– Ayxan
Apr 4 at 20:34
@Ayxan That would be another question, but for instance you may want to have a list of arbitrary operations to execute.
– Acorn
Apr 4 at 20:45
@Ayxan I have quickly posted it here: stackoverflow.com/q/55524710/9305398
– Acorn
Apr 4 at 20:52
1
Even though this is specific to MSVC, g++ gives the following similar error when trying to compile:error: cannot delete expression of type 'int (*)()'.. seems odd that MS would have missed something that simple in their docs :/
– txtechhelp
Apr 4 at 22:04
add a comment |
That code is invalid C++, because only pointers-to-objects can be deleted. *p has type int (*)(), which is a function pointer, not a pointer to an object.
Even MSVC itself does not compile it, even in permissive mode:
error C2541: 'delete': cannot delete objects that are not pointers
They should have used delete [] instead.
answered Apr 4 at 20:17
AcornAcorn
6,33611441
That code is invalid C++, because only pointers-to-objects can be deleted. *p has type int (*)(), which is a function pointer, not a pointer to an object.
Even MSVC itself does not compile it, even in permissive mode:
error C2541: 'delete': cannot delete objects that are not pointers
They should have used delete [] instead.
answered Apr 4 at 20:17
AcornAcorn
6,33611441
edited Apr 4 at 20:22
answered Apr 4 at 20:17
AcornAcorn
6,33611441
answered Apr 4 at 20:17
AcornAcorn
6,33611441
answered Apr 4 at 20:17
AcornAcorn
6,33611441
6,33611441
In what context one may need to dynamically allocate pointers to functions?
– Ayxan
Apr 4 at 20:34
@Ayxan That would be another question, but for instance you may want to have a list of arbitrary operations to execute.
– Acorn
Apr 4 at 20:45
@Ayxan I have quickly posted it here: stackoverflow.com/q/55524710/9305398
– Acorn
Apr 4 at 20:52
1
Even though this is specific to MSVC, g++ gives the following similar error when trying to compile:error: cannot delete expression of type 'int (*)()'.. seems odd that MS would have missed something that simple in their docs :/
– txtechhelp
Apr 4 at 22:04
add a comment |
In what context one may need to dynamically allocate pointers to functions?
– Ayxan
Apr 4 at 20:34
@Ayxan That would be another question, but for instance you may want to have a list of arbitrary operations to execute.
– Acorn
Apr 4 at 20:45
@Ayxan I have quickly posted it here: stackoverflow.com/q/55524710/9305398
– Acorn
Apr 4 at 20:52
1
Even though this is specific to MSVC, g++ gives the following similar error when trying to compile:error: cannot delete expression of type 'int (*)()'.. seems odd that MS would have missed something that simple in their docs :/
– txtechhelp
Apr 4 at 22:04
In what context one may need to dynamically allocate pointers to functions?
– Ayxan
Apr 4 at 20:34
In what context one may need to dynamically allocate pointers to functions?
– Ayxan
Apr 4 at 20:34
@Ayxan That would be another question, but for instance you may want to have a list of arbitrary operations to execute.
– Acorn
Apr 4 at 20:45
@Ayxan That would be another question, but for instance you may want to have a list of arbitrary operations to execute.
– Acorn
Apr 4 at 20:45
@Ayxan I have quickly posted it here: stackoverflow.com/q/55524710/9305398
– Acorn
Apr 4 at 20:52
@Ayxan I have quickly posted it here: stackoverflow.com/q/55524710/9305398
– Acorn
Apr 4 at 20:52
1
1
Even though this is specific to MSVC, g++ gives the following similar error when trying to compile:
error: cannot delete expression of type 'int (*)()' .. seems odd that MS would have missed something that simple in their docs :/– txtechhelp
Apr 4 at 22:04
Even though this is specific to MSVC, g++ gives the following similar error when trying to compile:
error: cannot delete expression of type 'int (*)()' .. seems odd that MS would have missed something that simple in their docs :/– txtechhelp
Apr 4 at 22:04
add a comment |
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ZXO 1urlY,0DxNO9NIDqq76Izd58fG5Xaz8fc,h56h4nu1 NTpjcuY
5
delete *pdiffers fromdelete [] p.– Jarod42
Apr 4 at 20:10
You're right. They're not the same.
– Cruz Jean
Apr 4 at 20:10
1
typedefwould make thing clearer.– Jarod42
Apr 4 at 20:10
Anyway
p[0]is not initialized. They have typo.– Jarod42
Apr 4 at 20:14
delete[]what wasnew[]ed anddeletewhat wasnewed. Though in modern code you should avoid most uses ofnew, it's no longer the preferred way of dynamically creating objects. Seestd::make_uniqueandstd::make_sharedinstead or use a standard container.– François Andrieux
Apr 4 at 20:29