C ++包括不起作用

Question

On the last several hours I'm trying desperately to figure out what is wrong, but in vain:

I have the following scenario: I had a working header, and I decided to move parts from it to a new another file.

So basically I have now:

FileA

......
class A;
.....

File B

#include FileA
.....
A B;
.....

But the variable A doesn't get recognized in fileB at all.

• All the definitions are under the same namespace
• Nothing is misspelled
• I'm using in the boost library and on debug mode I get : "intelisence: incompatible build options" (dont know yet if this connected or not to my problem)
• When looking on the code, the visual studio recognized all the types (ie when pressing on the type "A" in file B, the visual studio recognized it).

What am I doing wrong?

Following you request for the real code and further details: Let me be more specific I'm using the ifndef method and probably this causing to the mess, but I dont see why since fileB is the only one who includes fileA

The code itself looks like this:

    #ifndef MERKLE_BASICS_HPP
    #define MERKLE_BASICS_HPP
    #include "FullProofConsumer.hpp"
    #include <openssl\sha.h>
    namespace PCP_Project{
typedef unsigned char* HashDigest;
//Forward Declarations
HashDigest hashTwoElements(HashDigest,HashDigest);
HashDigest hash_GF2E_Element (GF2E);
HashDigest createZeroCommitment();
//The definition of the hashDigest type, for now its just long. Will be probably       replacedlater. 
//typedef unsigned char* HashDigest;

     }
    #endif

And then on the other file I have:

                #ifndef MERKLE_CONSUMER
                #define MERKLE_CONSUMER
                #include <fstream>
                #include "MerkleBasics.hpp"
                 namespace PCP_Project{
                 ......

                 HashDigest Value;
                  ...

And the compilation Error: Error 273 error C2146: syntax error : missing ';' before identifier 'Value'
(I have plenty of those, this is just one example) Sorry if from the original question you understood something defferent, and thanks again

Answer 1

It looks like in file A, you only have a forward declaration of the class:

class A;

That means you don't have a complete definition of the class, and thus unable to use instances of it - you can however use pointers.

You'll have to post more code for more help (properly formatted).

Answer 2

Looking at the description of your problem I take a random guess - have you by accident placed the SAME INCLUDE GUARDS in both the files ? In that case the include A will not work at all.