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by: Sergei |
last post by:
I ran into this problem. I needed to create an entry for access to a
library
of functions that are "extern C", and I just can't find the right syntax, if
it exists at all ( I am using MSVC 6.0-7.1).. Note, that basically I don't
need an "extern C" linkage,
I just need to define a type to cast a resolved function address..
Any ideas?
Basically , I need something like this..
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by: terrencel |
last post by:
I was told to look at some old C code that was ported to C++.
One of the file is like:
=========================================
CPPClass* someCPPVar = NULL;
extern "C"
{
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by: JKop |
last post by:
Okay here we go, I feel it's about time people conversed about the bullshit
aspects of C++ (including the bullshit stuff brought forward from C). I'll
begin with a few of my own grievances:
1) The whole "function declaration Vs object definition" fiasco, which
results in the following (temporary creating) syntax:
Blah poo = Blah();
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by: Generic Usenet Account |
last post by:
Our C++ program was linked with some legacy C functions. We had used
the extern "C" declaration, and everything was working fine. Then
someone thought that it would be better to have a consistent file
naming convention and renamed the files with the legacy C functions
from .c to .cxx. Lo and behold we started getting linker errors left
and right. When we reverted back to the old naming convention, the
problem went away. Also, the...
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by: Mark A. Gibbs |
last post by:
I have a question about mixing C and C++.
In a C++ translation unit, I want to define a function with internal
linkage and C calling convention. Here's a sample of what I want to do:
// main.cpp
// This is defined in a C module
extern "C" void fake_qsort(void*, std::size_t, std::size_t,
int (*compare)(const void*, const void*));
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by: G Patel |
last post by:
I've seen some code with extern modifiers in front of variables
declared inside blocks. Are these purely definitions (no definition)
or are they definitions with static duration but external linkage?
Not much on this in the FAQ or tutorials.
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by: ccwork |
last post by:
Hi all,
I am reading "C: A Reference Manual" 4th ed and I get lost for the
"extern". It says that global object without specifying the
storage-class specifier will have "extern" as the default storage-class
specifier. My (little) C experience tells me that an object with
"extern" is to let the linker knows that the object is referencing the
object defined in somewhere, and this "somewhere" object does not have
the storage-class specifier...
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by: kk_oop |
last post by:
Hi. I need to write a C++ callback function and register it with a C
program. I've read that this can be done if the callback function is a
static method. I've also read that I should use a global function with
the extern "C" prefix. I was leaning toward using the static method
approach until I saw a posting that said compatibility between static
C++ functions and C is not guaranteed in the respective language
standards. This made me...
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by: mimi |
last post by:
The programmer indicates to the compiler that a function is written
in a different programming language using a linkage directives.It is
intuitive that extern "SomeLanguage" is used to declare functions
written in the "SomeLanguage".
But I am quite confused what information does the linkage directive
tells the compiler.The "generated" function name? The way the
arguments are ordered?Or something else?
And I am still wondering why extern...
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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: 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: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
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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: 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...
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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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