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What are some uses of decltype(auto)?
In c++14 the decltype(auto) idiom is introduced.
2 Answers
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fastest MD5 Implementation in JavaScript
...= "",
d = "",
c;
for (c = 0; 3 >= c; c++) d = a >>> 8 * c & 255, d = "0" + d.toString(16), b += d.substr(d.length - 2, 2);
return b
}
var f = [],
q, r, s, t, a, b, c, d;
e = function(a) {
a = a.replace(/\r\n...
Conditions for automatic generation of default/copy/move ctor and copy/move assignment operator?
...or (because there are no move constructors or move assignment operators in C++03, this simplifies to "always" in C++03) (§12.8/8).
The copy assignment operator is auto-generated if there is no user-declared move constructor or move assignment operator (§12.8/19).
The destructor is auto-generated i...
What is the >>>= operator in C?
...@Kay: The hex float literals are part of C99, but GCC also accepts them in C++ code. As Dietrich notes, the p separates the mantissa and the exponent, just like the e in normal scientific float notation; one difference is that, with hex floats, the base of the exponential part is 2 instead of 10, so...
Sort points in clockwise order?
...;
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This is faster, because the compiler (tested on Visual C++ 2015) doesn't generate jump to compute dax, day, dbx, dby. Here the output assembly from the compiler:
; 28 : const int dax = ((a.x() - center.x()) > 0) ? 1 : 0;
vmovss xmm2, DWORD PTR [ecx]
vmovss xmm...
Is there any advantage of using map over unordered_map in case of trivial keys?
A recent talk about unordered_map in C++ made me realize that I should use unordered_map for most cases where I used map before, because of the efficiency of lookup ( amortized O(1) vs. O(log n) ). Most times I use a map, I use either int or std::string as the key type; hence, I've got...
asynchronous vs non-blocking
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Module X: "I".
Module Y: "bookstore".
X asks Y: do you have a book named "c++ primer"?
blocking: before Y answers X, X keeps waiting there for the answer. Now X (one module) is blocking. X and Y are two threads or two processes or one thread or one process? we DON'T know.
non-blocking: before Y a...
How do I check if a string is valid JSON in Python?
...he call stack and can be used as necessary (the procedural/C way). Just as C++ doesn't force you to use exceptions (you can use errno), Python shouldn't force it, either
– Braden Best
Jun 12 '18 at 1:17
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Does ruby have real multithreading?
...his answer is about the Shotgun VM, which doesn't exist anymore. The "new" C++ VM does not use green threads scheduled across multiple VMs (i.e. Erlang/BEAM style), it uses a more traditional single VM with multiple native OS threads model, just like the one employed by, say, the CLR, Mono, and pret...
Abstract class in Java
...good analogy would be to a method declaration (but no implementation) in a C++ header file?
– Schwaitz
Feb 20 '17 at 16:18
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