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C++ Tuple vs Struct
... collected using gcc-4.9.2 and clang-4.0.0:
std::vector<StructData> test_struct_data(const size_t N) {
std::vector<StructData> data(N);
std::transform(data.begin(), data.end(), data.begin(), [N](auto item) {
std::random_device rd;
std::mt19937 gen(rd());
...
Can you set a border opacity in CSS?
...or CSS3. I used the direct input validator with the following CSS code,
.test { border: 1px solid rgba(255, 0, 0, .5); }
The results were,
Value Error : border Too many values or values are not recognized :
1px solid rgba(255,0,0,0.5 )
Unfortunate that the alpha value (the letter "a" at...
Two submit buttons in one form
...he first solution shown in Parrot's answer is problematic, as it relies on testing the user-visible value. That is dubious - code that breaks when changing a user-visible word is considered "fragile". The second solution shown in Parrot's answer is fine - it is the same as this one. Parrot's second ...
Where does the @Transactional annotation belong?
...active transaction when the method is invoked.
I also have an integration test where I check all beans (bean post processor) for this annotation and fail if there is a @Transactional annotation with propagation other than Mandatory in a bean that does not belong to the services layer. This way I ma...
Can a CSV file have a comment?
...ing the file with a FOR command in a batch file a semicolon works (;)
REM test.bat contents
for /F "tokens=1-3 delims=," %%a in (test.csv) do @Echo %%a, %%b, %%c
;test.csv contents (this line is a comment)
;1,ignore this line,no it shouldn't
2,parse this line,yes it should!
;3,ignore this l...
For-each over an array in JavaScript
...erty(key) && // These checks are
/^0$|^[1-9]\d*$/.test(key) && // explained
key <= 4294967294 // below
) {
console.log(a[key]);
}
}
Note the three checks:
That the object has its own property by that name...
Finding a branch point with Git?
...d the following tree (letters assigned in chronological order), so I could test things out:
A - B - D - F - G <- "master" branch (at G)
\ \ /
C - E --' <- "topic" branch (still at E)
This looks a little different than yours, because I wanted to make sure that I got (r...
How to make PDF file downloadable in HTML link?
...ry/yourfile.pdf" download>Download the pdf</a>
Compatibility: I tested this on Firefox 21 and Iron, both worked fine. It might not work on HTML5-incompatible or outdated browsers. The only browser I tested that didn't force download is IE...
Check compatibility here: http://caniuse.com/#...
Difference between volatile and synchronized in Java
... the many permutations of what could happen, one is that thread-1 does the test for counter==1000 and finds it true and is then suspended. Then thread-2 does the same test and also sees it true and is suspended. Then thread-1 resumes and sets counter to 0. Then thread-2 resumes and again sets counte...
HTML5 LocalStorage: Checking if a key exists [duplicate]
...umerable: false
});
If the value isn't set, it returns null. You are testing to see if it is undefined. Check to see if it is null instead.
if(localStorage.getItem("username") === null){
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