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Android: ListView elements with multiple clickable buttons
I've a ListView where every element in the list contains a TextView and two different Buttons. Something like this:
8 Ans...
Is it possible to declare two variables of different types in a for loop?
...se a structured binding declaration. The syntax has been supported in gcc and clang for years (since gcc-7 and clang-4.0) (clang live example). This allows us to unpack a tuple like so:
for (auto [i, f, s] = std::tuple{1, 1.0, std::string{"ab"}}; i < N; ++i, f += 1.5) {
// ...
}
The above...
Java code for getting current time [duplicate]
...a.time
ZonedDateTime zdt = ZonedDateTime.now();
If needed for old code, convert to java.util.Date. Go through at Instant which is a moment on the timeline in UTC.
java.util.Date date = java.util.Date.from( zdt.toInstant() );
Time Zone
Better to specify explicitly your desired/expected time zo...
C＋＋模板的特化 - C/C++ - 清泛网 - 专注C/C++及内核技术
...stantiation;
notes: the compiler will use f3 as the instantiation for f1, and use f2 as the specialization for f1;
rule: specialization must be before instantiation (*);
Above we have discuss the template function, and then we'll focus on member template function.
acronym: MTF(member templat...
What is the difference between named and positional parameters in Dart?
Dart supports both named optional parameters and positional optional parameters. What are the differences between the two?
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C++11 rvalues and move semantics confusion (return statement)
I'm trying to understand rvalue references and move semantics of C++11.
6 Answers
6
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Why are Where and Select outperforming just Select?
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Select iterates once over the entire set and, for each item, performs a conditional branch (checking for validity) and a + operation.
Where+Select creates an iterator that skips invalid elements (doesn't yield them), performing a + only on the valid items.
So, the...
What is the purpose of Rank2Types?
...morphic. In the example map uses id as if it had type String -> String. And of course you can also pass a simple monomorphic function of the given type instead of id. Without rank2types there is no way for a function to require that its argument must be a polymorphic function and thus also no way...
What is the size of an enum in C?
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Taken from the current C Standard (C99): http://www.open-std.org/JTC1/SC22/WG14/www/docs/n1256.pdf
6.7.2.2 Enumeration specifiers
[...]
Constraints
The expression that defines the value of an enumeration constant shall be an integer
constan...
Procedure expects parameter which was not supplied
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I would check my application code and see what value you are setting @template to. I suspect it is null and therein lies the problem.
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