sequencing

Comma operator in C++11 (sequencing)

由 China☆狼群 提交于 2019-12-23 15:43:07
问题 The standard mentions f(a,(t=3,t+2),c); which would be an assignment-expression followed by an expression for the 2nd operator according to my understanding. But the grammar lists it juxtaposed: expression: assignment-expression expression, assignment-expression Working Draft, Standard for Programming Language C ++ Revision N4140 (November 2014) Is someone so nice as to explain to me please what it is that I'm missing here? 回答1: When you see expression: assignment-expression expression,

Cropping MIDI file using AudioKit

由 ▼魔方 西西 提交于 2019-12-23 13:20:14
问题 I am trying to crop and loop a certain part of a MIDI file using AudioKit . I am using a sequencer and found a couple of things that are close to what I need, but not exactly. I found a method in AKSequencer called clearRange . With this method I am able to silence the parts of the MIDI I don't want, but I haven't found a way to trim the sequencer and only keep the part I am interested in. Right now only the part I want has sound but I still get the silent parts. Is there a way to trim a

Resequencing a column with identifier in Postgresql

由 我只是一个虾纸丫 提交于 2019-12-20 06:38:24
问题 The following code works and creates a temporary table with a sequence number which is restarted for every new name: with results as (select row_number() over (partition by name order BY name) as mytid,name from telephn_table) select * from results order by name My objective however is to insert the new sequence number permanently into the telephone table. How do I transfer the new sequence number from the results table to the telephone table? I have come across the following for MySql but

Logic to generate an alphabetical sequence in C# [closed]

由 半世苍凉 提交于 2019-12-14 03:38:12
问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 4 years ago . The sequence should go like this. A-Z,AA-AZ,BA-BZ,CA-CZ,.......,ZA-ZZ After ZZ it should start from AAA . Then AAA to ZZZ and then AAAA to ZZZZ and so on. This sequence is pretty much like that of an Excel sheet. Edit: Added my code private void SequenceGenerator() { var numAlpha

Grep that tolerates mismatches to subset .fastq

由 心不动则不痛 提交于 2019-12-12 01:27:21
问题 I am working with bash on a linux cluster. I am trying to extract reads from a .fastq file if they contain a match to a queried sequence. Below is an example .fastq file containing three reads. $ cat example.fastq @SRR1111111.1 1/1 CTGGANAAGTGAAATAATATAAATTTTTCCACTATTGAATAAAAGCAACTTAAATTTTCTAAGTCG + AAAAA#EEEEEEEEEEEEEEEEEEEEEEEAEEEEEEEEEEEEEEEEEEEEEEEEEA<AAEEEEE<6 @SRR1111111.2 2/1 CTATANTATTCTATATTTATTCTAGATAAAAGCATTCTATATTTAGCATATGTCTAGCAAAAAAAA + AAAAA#EE6EEEEEEEEEEEEAAEEAEEEEEEEEEEEE/EAE

C++17 sequencing in assignment: still not implemented in GCC?

由 ╄→尐↘猪︶ㄣ 提交于 2019-12-07 08:01:01
问题 I tried the following code as a naive attempt to implement swapping of R and B bytes in an ABGR word #include <stdio.h> #include <stdint.h> uint32_t ABGR_to_ARGB(uint32_t abgr) { return ((abgr ^= (abgr >> 16) & 0xFF) ^= (abgr & 0xFF) << 16) ^= (abgr >> 16) & 0xFF; } int main() { uint32_t tmp = 0x11223344; printf("%x %x\n", tmp, ABGR_to_ARGB(tmp)); } To my surprise this code "worked" in GCC in C++17 mode - the bytes were swapped http://coliru.stacked-crooked.com/a/43d0fc47f5539746 But it is

C++17 sequencing in assignment: still not implemented in GCC?

由 眉间皱痕 提交于 2019-12-05 14:32:35
I tried the following code as a naive attempt to implement swapping of R and B bytes in an ABGR word #include <stdio.h> #include <stdint.h> uint32_t ABGR_to_ARGB(uint32_t abgr) { return ((abgr ^= (abgr >> 16) & 0xFF) ^= (abgr & 0xFF) << 16) ^= (abgr >> 16) & 0xFF; } int main() { uint32_t tmp = 0x11223344; printf("%x %x\n", tmp, ABGR_to_ARGB(tmp)); } To my surprise this code "worked" in GCC in C++17 mode - the bytes were swapped http://coliru.stacked-crooked.com/a/43d0fc47f5539746 But it is not supposed to swap bytes! C++17 clearly states that the RHS of assignment is supposed to be [fully]

Resequencing a column with identifier in Postgresql

由 对着背影说爱祢 提交于 2019-12-02 10:34:14
The following code works and creates a temporary table with a sequence number which is restarted for every new name: with results as (select row_number() over (partition by name order BY name) as mytid,name from telephn_table) select * from results order by name My objective however is to insert the new sequence number permanently into the telephone table. How do I transfer the new sequence number from the results table to the telephone table? I have come across the following for MySql but was not able to convert it to Postgresql. MySQL: Add sequence column based on another field Can anyone

Sequencing of function parameter destruction

由 不羁岁月 提交于 2019-12-01 02:28:19
According to C++14 [expr.call]/4: The lifetime of a parameter ends when the function in which it is defined returns. This seems to imply that a parameter's destructor must run before the code which called the function goes on to use the function's return value. However, this code shows differently: #include <iostream> struct G { G(int): moved(0) { std::cout << "G(int)\n"; } G(G&&): moved(1) { std::cout << "G(G&&)\n"; } ~G() { std::cout << (moved ? "~G(G&&)\n" : "~G()\n"); } int moved; }; struct F { F(int) { std::cout << "F(int)\n"; } ~F() { std::cout << "~F()\n"; } }; int func(G gparm) { std:

Sequencing of function parameter destruction

由 南楼画角 提交于 2019-11-30 22:05:34
问题 According to C++14 [expr.call]/4: The lifetime of a parameter ends when the function in which it is defined returns. This seems to imply that a parameter's destructor must run before the code which called the function goes on to use the function's return value. However, this code shows differently: #include <iostream> struct G { G(int): moved(0) { std::cout << "G(int)\n"; } G(G&&): moved(1) { std::cout << "G(G&&)\n"; } ~G() { std::cout << (moved ? "~G(G&&)\n" : "~G()\n"); } int moved; };
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