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C语言结构体里的成员数组和指针 - c++1y / stl - 清泛IT社区，为创新赋能！
...ain(int argc, char** argv) {
struct foo f={0};
if (f.a->s) {
printf( f.a->s);
}
return 0;
}复制代码
你编译一下上面的代码，在VC++和GCC下都会在14行的printf处crash掉你的程序...
ASP.NET “special” tags
...trol" %>).
<%@ %> is also an Application Directive. Used to specify application-specific settings for global.asax. Distinct from the page directives as it only uses a different tag set.
<% %> is a Code Render Block (for inline code). One of 4 forms of Embedded Code Blocks. Used for...
SQL - Update multiple records in one query
...UES(a),
b=VALUES(b),
c=VALUES(c);
This insert new values into table, but if primary key is duplicated (already inserted into table) that values you specify would be updated and same record would not be inserted second time.
...
How to reload apache configuration for a site without restarting apache
...s send SIGHUP which is equivalent to 'apachectl restart', which the OP specifically asked to avoid. Other Apache init scripts send SIGUSR1 which is equivalent to 'apachectl graceful', which is also a restart, but done more gracefully, and is what Aruman's answer provides.
– Br...
Precision String Format Specifier In Swift
...59265359 formatted with ".3" looks like 3.142
I think this is the most Swift-like solution, tying the formatting operations directly to the data type. It may well be that there is a built-in library of formatting operations somewhere, or maybe it will be released soon. Keep in mind that the langua...
What does tree-ish mean in Git?
...
The Short Answer (TL;DR)
"Tree-ish" is a term that refers to any identifier (as specified in the Git
revisions documentation) that ultimately leads to a (sub)directory
tree (Git refers to directories as "trees" and "tree objects").
In the original poster's case, foo is a directory that he want...
What is the meaning of erb?
...lar to ".rhtml" extension of rails file.
You can see a detailed and nice difference between ".html.erb" and ".rhtml" Click Here
Same as ".rhtml", you can also rename ".rjs" extension to ".js.erb" or ".rxml" to ".xml.erb"
This format separates out content type from template engine which is "erb" i...
How to disable zoom on Ctrl+scroll in Visual Studio 2010?
...
If it ever isn't the first link, the name is "Disable Mouse Wheel Zoom", and here is a direct link.
– Noah Richards
May 18 '10 at 23:49
...
How can I see the size of files and directories in linux? [closed]
How can I see the size of files and directories in Linux? If use df -m , then it shows the size of all the directory at the top level, but, for the directories and files inside the directory, how do I check the size?
...
“ArrayAdapter requires the resource ID to be a TextView” xml problems
...out_height="wrap_content"
// other attributes of the TextView
/>
If you want your list row layout to be something a little different then a simple TextView widget use this constructor:
new ArrayAdapter<String>(this, R.layout.a_layout_file,
R.id.the_id_of_a_textview_from_the_layo...