temporary Questions
1
Solved
Having class X, the following object initialization:
new (ptr) X(X());
requires an accessible destructor even since C++17. Why is that, when the object is initialized by the default constructor di...
Serenata asked 15/7 at 13:9
4
Solved
I'm having some problems with g++ and the compiling process for a C/C++ program which use Bluetooth libraries under Ubuntu.
If i use gcc, it works fine with no warning; on the contrary, if i use g...
3
I Want to create a temp collection in mongodb just like temp table in Sql Server.If it is possible then please let me know how can I do this.
4
Solved
I tested below queries using Databricks with Apache Spark 2.4:
%sql
<step1>
create temporary view temp_view_t
as select 1 as no, 'aaa' as str;
<step2>
insert into temp_view_t values...
Wahoo asked 30/3, 2020 at 1:56
4
Solved
I used mysql 5.7.16 community and centos 7.
I'm following a video tutorial to install mysql:
wget http://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm
yum localinstall dev.mysql....
2
Solved
Considering the case where no copy-elision is involved (pre C++17).
From cppreference (again, suppose C++14):
Temporary objects are created in the following situations:
binding a reference to a p...
3
I am a C++ newbie and I am struggling on the temporaries topic. I don't find anywhere a clear list of all cases in which the compiler will create a temporary. Actually, a few days ago I had in mind...
Featherbedding asked 2/2, 2022 at 17:56
9
Solved
7
I've tried to code like this several times:
struct Foo
{
double const& f;
Foo(double const& fx) : f(fx)
{
printf("%f %f\n", fx, this->f); // 125 125
}
double GetF() const
{
ret...
3
I see the concept of temporary table in oracle is quite different from other databases like SQL Server. In Oracle, we have a concept of global temporary table and we create it only once and in each...
3
When trying to insert 6000 rows into a temp table I get the following message
The number of row value expressions in the INSERT statement exceeds
the maximum allowed number of 1000 row values.
...
Aenea asked 19/5, 2015 at 8:5
6
Solved
Why does this:
#include <string>
#include <iostream>
using namespace std;
class Sandbox
{
public:
Sandbox(const string& n) : member(n) {}
const string& member;
};
int main(...
Jessjessa asked 6/5, 2010 at 20:31
4
Solved
How do I create and auto increment a temporary column in my select statement with MySQL?
Here is what I have so far:
SET @cnt = 0;
SELECT
(@cnt =@cnt + 1) AS rowNumber,
rowID
FROM myTable
WHER...
Dicotyledon asked 10/4, 2013 at 15:45
1
Solved
This is likely a textbook case of me not understanding some of the technicalities of the borrow checker, but it would be nice if someone could clear this up for me.
I have this (incredibly simplifi...
Travel asked 30/1, 2021 at 19:19
2
Solved
I need a temporary table in my programme. I have seen that this can be achieved with the "mapper" syntax in this way:
t = Table(
't', metadata,
Column('id', Integer, primary_key=True),
# ...
p...
Aileenailene asked 19/11, 2012 at 13:51
1
Solved
Following code gives the dangling pointer error.
std::vector<std::pair<std::string, int>> c;
for (auto& b : c) {
const auto& [s, i] = b;
std::string_view v = s.substr(i);
s...
Lamoree asked 3/11, 2020 at 5:36
6
Solved
I've got a std::vector which I need to sort by selected algorithms for certain operations, but to maintain its original state (e.g. items ordered by when they were entered) the rest of the time.
O...
6
Solved
Consider the following function:
void f(const char* str);
Suppose I want to generate a string using stringstream and pass it to this function. If I want to do it in one statement, I might try:
...
Hexameter asked 12/3, 2010 at 13:44
8
Solved
While debugging crash in a multithreaded application I finally located the problem in this statement:
CSingleLock(&m_criticalSection, TRUE);
Notice that it is creating an unnamed object of C...
3
Solved
I happened upon this problem where format! creates a temporary value in a pattern that is not anchored to anything, as far as I understand it.
let x = 42;
let category = match x {
0...9 => "Be...
2
Solved
consider something like this:
#include <iostream>
struct C {
C(double x=0, double y=0): x(x) , y(y) {
std::cout << "C ctor " << x << " " <<y << " " << ...
Fidelity asked 10/9, 2019 at 7:32
0
Consider this example from 7.6.1.10, paragraph 3 [expr.const.cast] (N4810):
typedef int *A[3]; // array of 3 pointer to int
typedef const int *const CA[3]; // array of 3 const pointer to const int...
Lamp asked 3/5, 2019 at 1:59
3
Solved
How to switch to specific Git commit without losing all the commits made after it?
I want that local files will be changed, but commits' database will remain intact, only the current position poin...
4
Solved
I search the stack overflow and people say it's stupid to modify temporary object, so binding temporary object to non-const lvalue reference is not allowed, like you can't pass a temporary object t...
Aarhus asked 14/7, 2018 at 11:57
2
Solved
I have a class Foo
class Foo;
a factory returning a pointer to it:
std::unique_ptr<Foo> createFoo();
and, since I have been told by Herb that a plain function with no special claim o...
Oregano asked 14/6, 2018 at 13:4
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