C++ :: Vector Of Classes With Overloaded Operators Not Compiling
Dec 6, 2014
I am working on a school project and am stuck in the debugging. I am compiling with g++ and am using c++11.
Error message
In file included from /usr/include/c++/4.7/algorithm:63:0,
from date.h:7,
from date.cpp:1,
from schedule.h:1,
from schedule.cpp:1,
from date_driver.cpp:1:
[Code] ....
Here are my overloaded operators for my date class.
What I'm trying to do is create a class for constructing an 'op tree' for parsing infix notation.
I started with a base class that uses a map of lambdas to actually calculate the operations (since they are mostly 1 line functions) of passed in integer or float values.
This base class just uses a templated T type as the lvalue and rvalue. I realized though that if I overload the math operators, +, -, etc.. I could also use the class itself as a type for the lvalue and rvalue. This lead me to think I could easily create the op tree by using Operation class members themselves as operands, which I think makes sense but I'm having some trouble expressing the code.
Example, if you look at the main() function I create normal operations easily with integer values. I then try to create a "tree" operation that includes 2 sub-operations as it's rvalue and lvalue, that is where I'm having some conceptual problems as far as implementing the code to do that.
I'm having an issue with output, luckily everything else works!! I'm working with Mixed Numbers and operations on them. So, here's the code I'm testing with:
I believe I have the syntax correct but I'm having difficulty calling my overloaded == operator in main (last snip-it of code). Below are several files explaining the code.
Commission.h here is where the friend bool operator == exists and I believe I have it initialized correctly.
#ifndef COMMISSION_H_INCLUDED #define COMMISSION_H_INCLUDED using namespace std; class Commission {
#include "tensor.h" int main() { Tensor<2,-2> m = {{1,2},{1,3}}; Tensor<2> v = {1,5}; std::cout<<m*v<<"
[Code] ....
Why do I get an ambiguity and why is not the wanted operator*-overload (the last one in the tensor.h file) not even mentioned as one of the candidates? Is it clear what I want to do? And if so, what can I do to make the call unambiguous?
RAT(RAT_INT num = 0, RAT_INT den = 1){ Num = num; Den = den;
[Code].....
Two questions: 1) In the second line in main, how does C++ know to convert 2 to the appropriate RAT? 2) Is it possible to make the third line in main valid without adding global operators for all the member operators to support plain integers?
This code is meant to open a file and use overloaded operators for a complex number class. I am getting a lot of errors in my class declaration/definition but I am not sure why.
S I want to have different >> operators for several derived classes. Has I tested...
Code: class base{ friend std::istream & operator>>(std::istream & in, base & v); public: base();
[Code]......
I noticed that the base operator is the only one being called for all 3 objects. which makes sense and now that I think about it I am more surprised that the "derived operators" compiled at all.
Still, how would I go about declaring different overloaded operators for the different classes?
I need to access the functions of the derived classes from a vector of objects of base classes (can't believe I wrote it). Here a Diagram for you to understand:
So as you see, I need the function Use() from the Usable class, to be able to be called from the vector like:
I have an array of (Student)classes created in Manager.h, which contains a new instance of class Name (name),(in Student.h)How would I go about accessing the SetFirstName method in Name.cpp if I was in a class Manager.cpp? I have tried using Students[i].name.SetFirstName("name");
// In Manager.h #include"Student.h" class Manager {
I'm taking an intro to c++ class and during an exercise I ran into multiple errors that are out of my knowledge to fix. The rest of the class is using Visual and that is all the instructor knows so i'm in my own figuring out Xcode. Basically I wrote the same program twice but one has a different struct and I get all sorts of errors with it. understand what the errors are and why they occurred.
The working program is this:
#include <iostream> #include <fstream> #include <iomanip> #include <cmath> using namespace std; struct point { public: double x1,y1; double x2,y2;
[code]....
This program does not compile and I get the following errors:
stl_iterator_base_types.h
1) Symantic Issue No type named 'value_type' in 'myPoint' 2) Symantic Issue No type named 'iterator_category in 'myPoint' 3) Symantic Issue No type named 'difference_type' in 'myPoint' 4) Symantic Issue No type named 'pointer' in 'myPoint' 5) Symantic Issue No type named 'reference' in 'myPoint'
I'm compiling some open source code (originally written for Linux / gcc) which uses the following line to determine if a particular section is being compiled for an x86 processor:-
have several linux header files included and when I compile my program I get the below errors..Am I NOT supposed to use some of these headers? Source is below as well.Looking through the headers mentioned in these errors, it's looking like stuff really is defined in multiple places...
Code:
codeblox@Lubuntu-pc:~/Programming/C/Network/MITM/src$ gcc -g -o mitm *.c In file included from mitm.h:12:0, from create_raw.c:1: /usr/include/netpacket/packet.h:22:8: error: redefinition of ‘struct sockaddr_ll’ In file included from /usr/include/linux/netdevice.h:30:0, from /usr/include/linux/if_arp.h:26, from mitm.h:10, from create_raw.c:1: }
I've a problem compiling my makefile. The additional files are enclosed.
the error I get: $make ./main gcc -ggdb main.c /tmp/ccPIxwjP.o: In function `main': /home/ilan/Embedded_linux/Lesson-2-Makefiles/lesson-2.1/main.c:6: undefined reference to `func1' /home/ilan/Embedded_linux/Lesson-2-Makefiles/lesson-2.1/main.c:7: undefined reference to `func2' collect2: error: ld returned 1 exit status make: *** [main.o] Error 1 $
Code: my make file: main : main.o file1.o file2.o gcc -ggdb main.o file1.o file2.o -o gdb-main main.o : main.c file1.h file2.h
I want to use two separate files in 1 program, but cannot get it to work. I don't know if it's my files or the compiling thats wrong. I have never used 2 files in my programs so far. Only used #include <stdio.h>.
Here are my files: extern_static.c Code: extern int i; int main(void) {
Code: /* Demonstrates using the gets() return value. */ #include <stdio.h> /* Declare a character array to hold input, and a pointer. */ char input[257], *ptr;
[Code]....
I just got this from the book that I am using and it is for testing for input of a blank line and readers are being warned in using this format (line 18):
Code: while ( (*ptr = gets(input)) != NULL)
What is the correct syntax if a gcc compiler is to be used?
I have a FTP server, client program and thus I can easily transfer files, however what I want is to modify the program such that server receives a c/c++ file, compiles the output, and sends a text file back to the client containing the output. The program should also take note that errors are also transferred.
I am currently having trouble to have getline to read line from the file. Error is: "no instance of overloaded function "getline" matches the argument list"
code is as follows:
std::ifstream config("config.txt"); string process[4]; int linecount = 1; if (config.is_open) { while (config.peek() !=EOF) { getline(config, process); linecount++; } }
The number of parameters to this function is variable It has all types of variables, function calls, etc.
The code has thousands of these lines
There is now a need for a special version of the compile that will remove a lot of the code, among others is the logging.
Can I somehow #define the "logthis" name into something that'll remove all actual calls to the code. including the actual parameters/expressions to the call.
I can't afford to add #ifdef/#endif around each of the calls because there are too many of them, and because that'll cause some undisired side effects in our code conformance tests.
Code: #define logthis __noop
comes close, that removes the call, but it still causes the compiler to evaluate and validate all the parameters to the logthis function, which doesn't work because in this case, removing the logging headers also removes other members of the class that get used as part of the parameters to logthis()
if I could define logthis into // resulting in all the rest of the line being comments, but that doesn't work.
Preferably I'd like something to be portable, but I'll take a solution that only works on visual studio as well.
