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How dangerous is it to compare floating point values?
...ode that quickly breaks. Erring on the side of assuming floating point results have large random fuzz associated with them (like most of the answers here suggest) will get you code that appears to work at first but ends up having large-magnitude errors and broken corner cases.
First of all, if you ...
How to merge a list of lists with same type of items to a single list of items?
... of TSources, convert each TSource in the list into an IEnumerable of TResults, then concatenate all those IEnumerables into one big one. In this case you have a list of lists to start, so if you want to concatenate them the function to map from a TSource (which is an IEnumerable of TResults) to an ...
The first day of the current month in php using date_modify as DateTime object
...duced in PHP 5.3). Otherwise the example above is the only way to do it:
<?php
// First day of this month
$d = new DateTime('first day of this month');
echo $d->format('jS, F Y');
// First day of a specific month
$d = new DateTime('2010-01-19');
$d->modify('first d...
Difference between size_t and std::size_t
...
C's size_t and C++'s std::size_t are both same.
In C, it's defined in <stddef.h> and in C++, its defined in <cstddef> whose contents are the same as C header (see the quotation below). Its defined as unsigned integer type of the result of the sizeof operator.
C Standard says in §17...
What's the meaning of * (asterisk) in XAML ColumnDefinition?
...ake up any available remaining space
The * is prefixed by a number (default is 1 if no number is specified). The available space is divided among the starred columns in proportion to the prefix number.
If you have this definition
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0.07*...
Get Enum from Description attribute [duplicate]
...
public static class EnumEx
{
public static T GetValueFromDescription<T>(string description) where T : Enum
{
foreach(var field in typeof(T).GetFields())
{
if (Attribute.GetCustomAttribute(field,
typeof(DescriptionAttribute)) is DescriptionAttri...
Spring JPA @Query with LIKE
...sername FROM User u WHERE u.username LIKE CONCAT('%',:username,'%')")
List<String> findUsersWithPartOfName(@Param("username") String username);
Notice: The table name in JPQL must start with a capital letter.
share
...
Smart way to truncate long strings
...k.
First you clip the string to the desired length, next you clip the result of that to its last word boundary
function truncate( str, n, useWordBoundary ){
if (str.length <= n) { return str; }
const subString = str.substr(0, n-1); // the original check
return (useWordBoundary
? subS...
Find location of a removable SD card
...urn A map of all storage locations available
*/
public static Map<String, File> getAllStorageLocations() {
Map<String, File> map = new HashMap<String, File>(10);
List<String> mMounts = new ArrayList<String>(10);
List<String> mVold...
Linq: adding conditions to the where clause conditionally
...ng to the DTO type, you can add Where clauses as you go, and build the results at the end:
var query = from u in DataContext.Users
where u.Division == strUserDiv
&& u.Age > 18
&& u.Height > strHeightinFeet
select u;
if (useAge)
query = query.Where(u => u.Ag...