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C++ performance challenge: integer to std::string conversion
...; 32) + (k));
}
template <typename T>
std::string itostr(T o) {
union {
char str[16];
unsigned short u2[8];
unsigned u4[4];
unsigned long long u8[2];
};
unsigned v = o < 0 ? ~o + 1 : o;
u8[0] = (ull(v) * 3518437209u) >> 45;
u8[0] ...
What are rvalues, lvalues, xvalues, glvalues, and prvalues?
...of rvalue, i.e. they're the rvalues that aren't xvalues.
Glvalues are the union of xvalues and lvalues in one group, because they do share a lot of properties in common.
So really, it all comes down to xvalues and the need to restrict movement to exactly and only certain places. Those places are ...
Questions every good .NET developer should be able to answer? [closed]
...nstances on this site where people are trying to roll their own version of Union Distinct and Concat for collections because they don't understand LINQ.
– Evan Plaice
Jun 19 '10 at 1:04
...
What are some compelling use cases for dependent method types?
...unless you subsume to their common supertype, because Scala doesn't have a union (disjunction) type. See my Q&A on subsumption in Scala.
– Shelby Moore III
May 19 '12 at 0:26
...
Are PDO prepared statements sufficient to prevent SQL injection?
...es, it's searching for a value in name, but imagine the "OR 1=1" part was "UNION SELECT * FROM users". You now control the query, and as such can abuse it...
– ircmaxell
Jan 25 '18 at 20:17
...
Which kind of pointer do I use when?
...covariant return and non-owning. A rewrite might be good if you meant the union rather than intersection. I'd also say that iteration is worth special mention also.
– Ben Voigt
Jan 2 '12 at 23:11
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What is the most effective way for float and double comparison?
...vate:
// The data type used to store the actual floating-point number.
union FloatingPointUnion {
RawType value_; // The raw floating-point number.
Bits bits_; // The bits that represent the number.
};
// Converts an integer from the sign-and-magnitude representation to
// t...
Is a statically-typed full Lisp variant possible?
...which is nothing new in Typed Racked (same deal as a function that takes a union type of String and Number). An implicit way to see that this can be done is the fact that you can write and use a dynamically typed language in an HM-statically-typed language.
– Eli Barzilay
...
What Every Programmer Should Know About Memory?
... if you want efficient loads of just one half of the object, you need ugly union hacks: How can I implement ABA counter with c++11 CAS?. (Don't confuse DWCAS with DCAS of 2 separate memory locations. Lock-free atomic emulation of DCAS isn't possible with DWCAS, but transactional memory (like x86 T...
SQL injection that gets around mysql_real_escape_string()
...sers. In the latter case, the second query is usually executed by use of a UNION clause.
– Jacco
May 21 '12 at 9:47
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