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What are the advantages of using nullptr?
...pecified by C standard useless in many C++ expressions. For example:
std::string * str = NULL; //Case 1
void (A::*ptrFunc) () = &A::doSomething;
if (ptrFunc == NULL) {} //Case 2
If NULL was defined as (void *)0, neither of above expressions would work.
Case 1: Will not com...
Tetris-ing an array
...
Write a function longest_common_prefix that takes two strings as input. Then apply it to the strings in any order to reduce them to their common prefix. Since it is associative and commutative the order doesn't matter for the result.
This is the same as for other binary operati...
What to do with “Unexpected indent” in python?
... statement). All lines of code in a block must start with exactly the same string of whitespace. For instance:
>>> def a():
... print "foo"
... print "bar"
IndentationError: unexpected indent
This one is especially common when running python interactively: make sure you don't put a...
What's “wrong” with C++ wchar_t and wstrings? What are some alternatives to wide characters?
...e in the C++ community(particularly ##c++ on freenode) resent the use of wstrings and wchar_t , and their use in the windows api. What is exactly "wrong" with wchar_t and wstring , and if I want to support internationalization, what are some alternatives to wide characters?
...
jQuery dot in ID selector? [duplicate]
...
This is also a lot of extra processing on jQuery's part that is unnecessary, where all you really need to do is escape the "." character...
– Ian
Nov 25 '12 at 7:48
...
What is the string length of a GUID?
...
It depends on how you format the Guid:
Guid.NewGuid().ToString() => 36 characters (Hyphenated)
outputs: 12345678-1234-1234-1234-123456789abc
Guid.NewGuid().ToString("D") => 36 characters (Hyphenated, same as ToString())
outputs: 12345678-1234-1234-1234-123456789abc
Guid.New...
How many and which are the uses of “const” in C++?
... compiler help you to decide when and when not you need to copy.
struct MyString {
char * getData() { /* copy: caller might write */ return mData; }
char const* getData() const { return mData; }
};
Explanation: You might want to share data when you copy something as long as the data of th...
What is the difference between memmove and memcpy?
... location pointed by the destination. (http://www.cplusplus.com/reference/cstring/memcpy/)
Consider the following examples:
#include <stdio.h>
#include <string.h>
int main (void)
{
char string [] = "stackoverflow";
char *first, *second;
first = string;
second = string...
What does a type followed by _t (underscore-t) represent?
...nd probably some others I've forgotten. The C99 standard defines a lot of extra types, such as uintptr_t, intmax_t, int8_t, uint_least16_t, uint_fast32_t, and so on. These new types are formally defined in <stdint.h> but most often you will use <inttypes.h> which (unusually for standar...
NSLog the method name with Objective-C in iPhone
...
print(__FUNCTION__) // Swift
NSLog(@"%@", NSStringFromSelector(_cmd)); // Objective-C
Swift 3 and above
print(#function)
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