logo
down
shadow

Legal to forward declare C standard library entities but not C++ standard library entities?


Legal to forward declare C standard library entities but not C++ standard library entities?

Content Index :

I wish this help you The problem is that C++ and C are not compatible at the object level... For example it's different to write:
double atof(const char *);
extern "C" {
    double atof(const char *);
}

Comments
No Comments Right Now !

Boards Message :
You Must Login Or Sign Up to Add Your Comments .

Share : facebook icon twitter icon

Does IronPython .net based DLL need to be deployed with Python Standard Library if it uses the Standard Library?


Tag : .net , By : Steve M
Date : March 29 2020, 07:55 AM
should help you out you need to deploy the python libraries you're referencing along with your dll. it wont be included statically in there for you.

Which parts of the C standard library are not covered by (the rest of) the C++ standard library?


Tag : cpp , By : adrianmooreuk
Date : March 29 2020, 07:55 AM
wish of those help There aren't that many headers, so lets just list them. Some could be replaced by language facilities, rather than libraries. (I haven't enumerated every function in each header, so I might have missed the odd function that doesn't have a C++ alternative when most of its colleagues do.)
C library         C++ alternatives
assert.h          Exceptions
complex.h         <complex>
ctype.h           None (or maybe <locale>, if you want to jump down that rabbit-hole)
errno.h           None (but only applies to C functions)
fenv.h            None
float.h           <limits>
inttypes.h        (See breakdown)
   formatting     <iostream>
   strto...       <string> (C++11), <sstream>
   imaxabs        std::abs overloads
   imaxdiv        std::div overloads
iso646.h          Language
locale.h          <locale>
math.h            None (extended with C++ overloads)
setjmp.h          Exceptions
signal.h          None
stdarg.h          Variadic templates (C++11)
stdbool.h         Language
stddef.h          None
stdint.h          None
stdio.h           <iostream> etc.
stdlib.h          (See breakdown)
   atof etc.      <sstream>, <string> (C++11)
   rand etc.      <random> (C++11)
   malloc etc.    new, containers
   abort etc.     None
   bsearch etc.   <algorithm>
   abs etc.       None (extended with C++ overloads)
   mb strings     None
string.h          <string>, <algorithm>
tgmath.h          <cmath> (C++ overloads)
time.h            <chrono> (C++11)
wchar.h           <iostream> etc.
wctype.h          None

Forward declare entities in C standard library?


Tag : c , By : ck1
Date : November 23 2020, 01:01 AM
This might help you Forward declarations of structs are always permissible in C. However, not very many types can be used this way. For example, you can't use a forward declaration for FILE simply because the tag name of the struct is not specified (and theoretically, it may not be a struct at all).
Section 7.1.4 paragraph 2 of n1570 gives you permission to do the same with functions:
void *malloc(size_t);
void abort(void);

/* my code here */

Idris: Hiding data types from standard library, or not importing standard library


Tag : development , By : Mariamario
Date : March 29 2020, 07:55 AM
I wish this help you I know there is a way to hide functions from imported libraries, with %hide. But it does not seem to work on data type names, like Nat and Vect. Is there any way to hide data type names, or just not import the standard library? , There are several relevant command-line options:
$ man idris
...
   --nobasepkgs             Do not use the given base package
   --noprelude              Do not use the given prelude
   --nobuiltins             Do not use the builtin functions
...
$ idris
Idris> :t Nat
Nat : Type

$ idris --noprelude
Idris> :t Nat
No such variable Nat

Is there a standard library way to convert text to HTML entities in Python 2.7?


Tag : python , By : ganok_tor
Date : March 29 2020, 07:55 AM
will be helpful for those in need The library xml.sax.saxutils is standard and can escape and unescape xml in Python 2.7
from xml.sax.saxutils import escape, unescape

mystr = escape('x < 7 && I like math && y > 7')
print(mystr)
# x &lt; 7 &amp;&amp; I like math &amp;&amp; y &gt; 7
print(unescape(mystr))
# x < 7 && I like math && y > 7
Related Posts Related QUESTIONS :
  • Could this publish / check-for-update class for a single writer + reader use memory_order_relaxed or acquire/release for
  • Passing a function identifier as an rvalue reference and applying std::move() to it
  • The conditional operator is not allowing the program to terminate
  • Define a c++ string as "\"
  • memcpy on __declspec naked returns unexpected bytes
  • What is the proper way to link enums with CMake?
  • is it safe to use the same mutex with lock_gard and without it in other parts of code
  • How to decode MAP Invoke messages using asn1c generated code
  • How do you write multiple lines in a .txt with recursion?
  • Member function with strange type causing callback function mismatch
  • Visual Studio optimisations break SDL graphical output
  • How to use less memory in Sieve_of_Eratosthenes
  • Covariance in Callback Parameters C++
  • switch may fall through (no it may not)
  • Compilation fails calling Cocoa function from C++
  • How to handle classes with differently named member functions in algorithms?
  • Convert QString to QJsonArray
  • Data exchange finished in CPropertyPage::OnOK?
  • Template member specialization in template class
  • Is it not possible to assign a struct to an index of a vector?
  • Why is empty unordered_map.find not returning end()?
  • Template argument deduction for inheriting specializations
  • dlopen undefined reference
  • Member function of class with template arguments and default arguments outside class
  • Is it possible to implement a non-owning "slightly smart" pointer on top of standard weak pointers?
  • how to configure the AcquireCredentialsHandleA correctly
  • Using private versions of global extern variables with OpenMP
  • Eigen Block wrong amount of columns and rows
  • Memory alignment rules in inheritance
  • Is nullptr falsy?
  • tm_wday returns a large integer outside 0-6 range
  • Scope a using declaration, inside a header
  • How to specify constructor's template arguments inside a new expression?
  • Sort an array via x86 Assembly (embedded in C++)?? Possible?
  • How to Replace only Part of the Variable using #define
  • How do you compare the performace of valarrays vs built-in arrays?
  • Is it normal for C++ static initialization to appear twice in the same backtrace?
  • c++ generate a good random seed for psudo random number generators
  • Why isn't my operator overloading working properly?
  • Getting meaningful error messages from fstream's in C++
  • C++: Converting Julian dates to Gregorian
  • Could someone explain this interesting behaviour with Sleep(1)?
  • Is it possible to roll a significantly faster version of modf
  • Updating pointer using signals and slots
  • How are classes more secure than structures?
  • finding "distance" between two pixel's colors
  • C++ Greatest Number Verification
  • Why does my token return NULL and how can I fix it?(c++)
  • C++ enforce conditions on inherited classes
  • what happened if an exception is not captured?
  • Redundant naming in C/C++ typedefs/structs
  • question about STL thread-safe and STL debugging
  • killing a separate thread having a socket
  • Returning the size of available virtual memory at run-time in C++
  • Parallel computing for integrals
  • How do I force my std::map to deallocate memory used?
  • C++ Templates: implicit conversion, no matching function for call to ctor
  • Adding python script to c++ project
  • C++ private pointer "leaking"?
  • Initializing Primitive Array to One Value
  • shadow
    Privacy Policy - Terms - Contact Us © scrbit.com