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How to declare std::unique_ptr and what is the use of it?
...t of scope.
This way you do not have to remember doing delete on objects allocated dynamically - the destructor of the smart pointer will do that for you - nor to worry about whether you won't dereference a (dangling) pointer to an object that has been destroyed already:
{
unique_ptr<int&g...
Oracle 11.2.0.4 RAC FOR redhat 6.4 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...成修改语句：
Sql代码
1.select 'alter table '||table_name||' allocate extent;' from user_tables where num_rows=0
然后就在结果窗口里面生成了下面那些东西：
Sql代码
1.alter table E2USER_STATE allocate extent;
2.alter table ENTERPRISE_E2USER allocat...
How to send an email from JavaScript
... var form_id_js = "javascript_form";
var data_js = {
"access_token": "{your access token}" // sent after you sign up
};
function js_onSuccess() {
// remove this to avoid redirect
window.location = window.location.pathname + "?message=Email+Successfully+Sent%21&...
How do I declare a 2d array in C++ using new?
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Remember that anything allocated with new is created on the heap and must be de-allocated with delete, just keep this in mind and be sure to delete this memory from the heap when you're done with it to prevent leaks.
– Kekoa
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How do I download a tarball from GitHub using cURL?
...ix.
You can also retrieve the archive of a private repo, by specifying -u token:x-oauth-basic option to curl. Replace token with a personal access token.
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How does free know how much to free?
... pointer you like as an argument to free, how does it know the size of the allocated memory to free? Whenever I pass a pointer to some function, I have to also pass the size (ie an array of 10 elements needs to receive 10 as a parameter to know the size of the array), but I do not have to pass the s...
What are the dangers when creating a thread with a stack size of 50x the default?
...f the data ( float[] s) that I'll be accesing onto the stack (using stackalloc ).
8 Answers
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How does this checkbox recaptcha work and how can I use it?
...d and the server stores this information in a temporary storage (marks the token: this token was activated by a human). When you submit the form, a hidden field sends the token which was activated, then when the server validates the form information it will recognize that the token was activated. If...
Why use double indirection? or Why use pointers to pointers?
...****biolibrary;
char ******lol;
//fill data structure
word = malloc(4 * sizeof *word); // assume it worked
strcpy(word, "foo");
sentence = malloc(4 * sizeof *sentence); // assume it worked
sentence[0] = word;
sentence[1] = word;
sentence[2] = word;
sentence[3] =...
C++ Object Instantiation
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On the contrary, you should always prefer stack allocations, to the extent that as a rule of thumb, you should never have new/delete in your user code.
As you say, when the variable is declared on the stack, its destructor is automatically called when it goes out of scope...