Is it correct and safe to compare a string object with "", a pair of
quotation marks quoted empty string?If the string object: s = ""; does
s contain a single '\'? Is it better to use std::string::si ze or
std::string::em pty to deal with this condition? Thank you.
string s = "";
if (s == "");
if (s.size == 0);
if (s.empty());
Jan 24 '07
10  9069 
On Wed, 24 Jan 2007 18:44:26 +0100, "Bo Persson" <bo*@gmb.dkwrot e:
>Roland Pibinger wrote:
>On Wed, 24 Jan 2007 11:14:46 +0100, Michael DOUBEZ wrote:
>>But then, what about section 21.3.8.2:
template<clas s charT, class traits, class Allocator>
bool operator==(cons t basic_string<ch arT,traits,Allo cator>& lhs,
const charT* rhs);
3 Returns:lhs == basic_string<ch arT,traits,Allo cator>(rhs).
I'd call that a contradiction in terms.
Sort of, but not really.
The "Returns:" element of the description prescribes the value returned by
the function/operator, not how the value has to be computed.
Seems to be a plausible interpretation since the C++ Standard (AFAIK)
never prescribes a certain library implementation.
Best regards,
Roland Pibinger This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
by: Matt |
last post by:
if (123 > 33) will return true
and
if ("123" > 33) will return true
So my question is, if the above behaviors are the same?? If string is
a number, and
compare with another number, it will be the same behavior as compare 2
numbers?
|
by: Indrid Colt |
last post by:
Thank's for your help !
Indrid
|
by: Fei Liu |
last post by:
In Accellerated C++, the author recommends that in a header file one should
not declare
using std::string, using std::vector etc instead one should directly specify
the namespace specifier in code.
for example, this is bad practice:
header.h
#include <string>
using std::string;
|
by: dhtmlkitchen |
last post by:
Why does "foo" instanceof String return false?
It just seems counterintuitive to me.
I mean, sure, I can always check the constructor:
var fooVar = "foo";
var isString = fooVar.constructor == String;
|
by: pureenhanoi |
last post by:
Hi bro!
Can anyone tell me, how to compare two strings like Operating System compare file names.
Example: if i have two string "T*.DOC" and "TIET1.DOC". The comparision operator must return TRUE values when compare them
| | |
by: Sami |
last post by:
string = "" or string = string.Empty?
should is the proper way?
Sami
|
by: ndoe |
last post by:
how to compare string in file i mean compare that string content digit or alphabet,and 1 question more can we count that line if first line variable = 1,if read second line variable = 2 and so on thanks
e.g
i have file with name data.txt with file like this
123456
|
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...
|
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...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
|
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...
| | |
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...
|
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
|
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
|
by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
|
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...
| |
