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What is the performance cost of having a virtual method in a C++ class?
... be non-virtual is an abominable policy.
– underscore_d
May 20 '17 at 19:34
add a comment
...
Java: PrintStream to String?
...= new ByteArrayOutputStream();
final String utf8 = StandardCharsets.UTF_8.name();
try (PrintStream ps = new PrintStream(baos, true, utf8)) {
yourFunction(object, ps);
}
String data = baos.toString(utf8);
...
How to detect iPhone 5 (widescreen devices)?
...eight of 568.
You can imagine a macro, to simplify all of this:
#define IS_IPHONE_5 ( fabs( ( double )[ [ UIScreen mainScreen ] bounds ].size.height - ( double )568 ) < DBL_EPSILON )
The use of fabs with the epsilon is here to prevent precision errors, when comparing floating points, as pointe...
Build tree array from flat array in javascript
...ibrary. It's, as far as I can tell, the fastest solution.
function list_to_tree(list) {
var map = {}, node, roots = [], i;
for (i = 0; i < list.length; i += 1) {
map[list[i].id] = i; // initialize the map
list[i].children = []; // initialize the children
}
for (i = 0; i ...
PostgreSQL Crosstab Query
...m is also limited to exactly three columns in the provided input query: row_name, category, value. There is no room for extra columns like in the 2-parameter alternative below.
Safe form
crosstab(text, text) with 2 input parameters:
SELECT *
FROM crosstab(
'SELECT section, status, ct
FR...
Unexpected results when working with very big integers on interpreted languages
...ger types. All numbers are floating points.
– toasted_flakes
Aug 4 '13 at 22:27
8
@grasGendarme T...
in_array() and multidimensional array
I use in_array() to check whether a value exists in an array like below,
22 Answers
...
一分钟明白 VS manifest 原理 - C/C++ - 清泛网 - 专注C/C++及内核技术
...件中，assembly的版本信息被指明了。如crtassem.h中
#ifndef _CRT_ASSEMBLY_VERSION
#define _CRT_ASSEMBLY_VERSION "8.0.50608.0"
#endif
可以修改8.0.50608.0为8.0.50727.42以产生你想要的manifest信息。
若我想将我的程序发布为独立程序集（isolated application)...
Pagination in a REST web application
... Range header also works to declare an order:
Range: products-by-date=2009_03_27-
to get all products newer than that date or
Range: products-by-date=0-2009_11_30
to get all products older than that date. '0' is probably not best solution, but RFC seems to want something for range start. There...
Initializing a static std::map in C++
...namespace std;
using namespace boost::assign;
map<int, char> m = map_list_of (1, 'a') (3, 'b') (5, 'c') (7, 'd');
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