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std::string to char*
...ew contents, one way (given that you don't know the string size at compile-time) is dynamic allocation:
char* ca = new char[str.size()+1];
std::copy(str.begin(), str.end(), ca);
ca[str.size()] = '\0';
Don't forget to delete[] it later.
If you want a statically-allocated, limited-length array inst...
How to read the content of a file to a string in C?
...is to stably capture in memory the contents of a file at a given moment in time, this solution should be avoided, unless you are certain that the file being read into memory will not be modified by other processes during the interval over which the map will be used. See this post for more informatio...
How many characters can UTF-8 encode?
...
UTF-8 does not use one byte all the time, it's 1 to 4 bytes.
The first 128 characters (US-ASCII) need one byte.
The next 1,920 characters need two bytes to encode. This covers the remainder of almost all Latin alphabets, and also Greek, Cyrillic, Copti...
MongoDB与内存 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
...习更有效，那就先看一个MongoDB服务器的top命令结果：
shell> top -p $(pidof mongod)
Mem: 32872124k total, 30065320k used, 2806804k free, 245020k buffers
Swap: 2097144k total, 100k used, 2097044k free, 26482048k cached
VIRT RES SHR %MEM
1892g 21g 21g 69.6
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Do AJAX requests retain PHP Session info?
...de cross-domain, but only if the response type is jsonp. I do this all the time.
– Epiphany
Dec 3 '12 at 16:19
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What's wrong with using $_REQUEST[]?
... here saying not to use the $_REQUEST variable. I usually don't, but sometimes it's convenient. What's wrong with it?
15 ...
Is it better in C++ to pass by value or pass by constant reference?
Is it better in C++ to pass by value or pass by constant reference?
10 Answers
10
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Unable to Cast from Parent Class to Child Class
...= new Person(); // p is true Person object
Employee e = (Employee)p; //Runtime err : InvalidCastException <-------- Yours issue
Case 3. Parent variable holding child object (Always Successful)
Note: Because objects has polymorphic nature, it is possible for a variable of a parent class...
How to read lines of a file in Ruby
I was trying to use the following code to read lines from a file. But when reading a file , the contents are all in one line:
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How do you make a HTTP request with C++?
Is there any way to easily make a HTTP request with C++? Specifically, I want to download the contents of a page (an API) and check the contents to see if it contains a 1 or a 0. Is it also possible to download the contents into a string?
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