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by: Davis King |
last post by:
Can I assume that std::swap will not throw when it is used to swap
std::string objects?
In the standard it says that the swap() std::string member function runs
in constant time.
I didn't see anything that said that swapping strings was guaranteed to
not throw though. But it would seem
that a constant time swap ought not to throw though. I can't really see
a way to implement one that does throw without
deliberately sabotaging it at...
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by: ma740988 |
last post by:
So I'm reading the C++ coding standards(Shutter & Andrei), more
specifically item 56. There's a statement:
"Prefer to provide a nonmember swap function in the same namespace as
your type when objects of your type have a way to exchange their values
more efficiently than via brute-force assignment, such as if they have
their own swap or equivalent function. Additionally, consider
specializing std::swap for your own template types:"
...
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by: Jason Heyes |
last post by:
Does the STL have a function like this one?
template <typename T>
void remove(std::vector<T> &v, std::vector<T>::size_type index)
{
std::swap(v, v.back());
v.resize(index);
}
Unlike std::vector::erase, it calls T::operator= only three times no matter
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by: Sung Jin Hwang |
last post by:
Hi.
Is there a good way to extend std::swap to user type classes?
Overloading can be a solution but when user type is not a
class but class template, we need partial specialization and
function partial specialization is not allowed.
What I can easily think about is to define a function in the
namespace which contains the user type but this forces to
use a namespace (well... though it is better to use namespaces)
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by: Niels Dekker (no reply address) |
last post by:
When calling swap as follows (as recommanded in Effective C++, 3rd
Edition, by Scott Meyers), what swap is chosen to be called?
using std::swap;
swap(a, b);
Suppose there is a global ::swap function provided, whose parameter type
matches closer to the type of a and b than any of the std::swap
overloads does. Will this ::swap be called, or is std::swap still
preferred? I ask this because the compilers I tried disagree! So will
any of...
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by: ma740988 |
last post by:
Consider:
# include <vector>
# include <iostream>
# include <cstdlib>
# include <ctime>
bool
ispow2i ( double n )
{
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by: ma740988 |
last post by:
Data stored on a storage device is byte swapped. The data is big
endian and my PC is little. At issue: There's a composite type ( a
header ) at the front of the files that I'm trying to read in. I'm
trying to _simulate_ the endian conversion in code below but I'm just
wondering if there's an ideal way to do this besides what's shown?
Padding produces some interesting results. Notice how the parameter d
is different in the print outs...
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by: Jess |
last post by:
Hello,
It is said that if I implement a "swap" member function, then it
should never throw any exception. However, if I implement "swap" non-
member function, then the restriction doesn't apply. Can somebody tell
me why?
Thanks,
Jess
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by: Juha Nieminen |
last post by:
I'm sure this is not a new idea, but I have never heard about it
before. I'm wondering if this could work:
Assume that you have a common base class and a bunch of classes
derived from it, and you want to make a deque which can contain any
objects of any of those types. Normally what you would have to do is to
make a deque or vector of pointers of the base class type and then
allocate each object dynamically with 'new' and store the...
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
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by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
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by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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