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Is std::vector so much slower than plain arrays?
... created. What happens if we change Pixel to:
struct Pixel
{
unsigned char r, g, b;
};
Result: about 10% faster. Still slower than an array. Hm.
# ./vector
UseArray completed in 3.239 seconds
UseVector completed in 5.567 seconds
Idea #4 - Use iterator instead of loop index
How about usin...
How to display a specific user's commits in svn log?
...rlet sel -t -m 'log/logentry' \
--if "author = '<AUTHOR>'" \
-v "concat('Revision ', @revision, ' ', date)" -n -v msg -n -n
From here you could go into more advanced XML queries.
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How to determine CPU and memory consumption from inside a process?
...hysMemUsedByMe = pmc.WorkingSetSize;
CPU currently used:
#include "TCHAR.h"
#include "pdh.h"
static PDH_HQUERY cpuQuery;
static PDH_HCOUNTER cpuTotal;
void init(){
PdhOpenQuery(NULL, NULL, &cpuQuery);
// You can also use L"\\Processor(*)\\% Processor Time" and get individual CPU...
How can I get a java.io.InputStream from a java.lang.String?
...but that has been @Deprecrated (with good reason--you cannot specify the character set encoding):
8 Answers
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How do pointer to pointers work in C?
...his case, if this is the only occurrence of "hello" in memory then,
const char *c = "hello";
... defines c to be a pointer to the (read-only) string "hello", and thus contains the value 63. c must itself be stored somewhere: in the example above at location 58. Of course we can not only point to ...
Base64: What is the worst possible increase in space usage?
...y possibly become when converted to a Base64 string (assuming one byte per character)?
5 Answers
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MySQL error 1449: The user specified as a definer does not exist
...or views
Run this SQL to generate the necessary ALTER statements
SELECT CONCAT("ALTER DEFINER=`youruser`@`host` VIEW ",
table_name, " AS ", view_definition, ";")
FROM information_schema.views
WHERE table_schema='your-database-name';
Copy and run the ALTER statements
How to change the define...
URLEncoder not able to translate space character
...be encoded as follows:
Control names and values are escaped. Space characters are replaced
by `+'
You will have to replace it, e.g.:
System.out.println(java.net.URLEncoder.encode("Hello World", "UTF-8").replace("+", "%20"));
...
How do I match any character across multiple lines in a regular expression?
... is:
/(.*)<FooBar>/s
The s at the end causes the dot to match all characters including newlines.
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Parsing a comma-delimited std::string [duplicate]
...
Input one number at a time, and check whether the following character is ,. If so, discard it.
#include <vector>
#include <string>
#include <sstream>
#include <iostream>
int main()
{
std::string str = "1,2,3,4,5,6";
std::vector<int> vect;
...