I'm sure this is quite a simple one, but as a beginner i just can't work it out. Any help would be much appreciated.
I have a main form Form1, which includes classes in headers called staticData.h and dynamicData.h
Within staticData.h, i have a struct called city:
struct
city{
public
: int cityID; char cityName[22]; char countryID[2]; char countryName[20]; double lng, lat; int annualDemand; int populationrank; bool shown;};
When i initialise form 1, in form1.cpp, i declare a global array of city structs (City)
#include
"stdafx.h"#include
"staticData.h"#include
"dynamicData.h"#include
"Form1.h" using namespace supplychaingame;city City[800];
[STAThreadAttribute]
int
Main(){
Application::EnableVisualStyles();
// Application::EnableRTLMirroring();
Application::Run(
gcnew Form1()); return 0;}
.... the City data is populated from a file when Form1 loads.
The City data is then used numerous times around the Form1, staticData classes, using the syntax:
extern city City[];
to define the variable
This has been working just fine.
However, when I try and add this syntax in a managed class in my dynamicData header, I get an error on the staticData sheet -
'City' : city[] differs in levels of indirection from "unknown-type"
the errors match the extern city City[]; declarations in staticData
Any ideas where I'm going wrong here
Passing an array of structs
Ilyas Kazi
The compiler is correct:
city City[800]
and
extern city City[];
are very different - the compiler cannot know how much memory is required in the second declaration. Try the following instead:
extern city City[800];
this will ensure that the compiler always knows how big the array is.
Even better don't use global variables like this.
LaoZheng
Changing to city City[800];
doesn't make any difference, however. I still get the same error.
I am actually gradually in the process of migrating away from all the global variables. However, in the meantime, I need to be able to get this to work.
In a nutshell, how can I make my global struct array visible to all classes without getting a 'differs in levels of indirection' error
Thanks