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Errors in header file

hiephoi (11)
Hello everyone! I just started learning C++ and I've created a header file (generate_input.hpp) to use in two source programs (generate_input.cpp and generate_test.cpp). I get a bunch of errors and I know where the problem is, but I just can't figure it out on my own, so I hope there's someone that wants to help me. Thanks in advance!

Here's my code:

generate_input.hpp
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#ifndef GENERATE_INPUT_H_
#define GENERATE_INPUT_H_

#include <gmp.h>
#include <flint.h>
#include <fmpz.h>
#include <fmpz_poly.h>
#include <cstdlib>

extern const int length;

void rand_code(fmpz_t (&u_code)[length]);
void inv_code(fmpz_t u_code[], fmpz_t (&u_code_inv)[length]);
void rand_mask(fmpz_t (&u_mask)[length]);
void combined_masks(fmpz_t (&u_maskAB)[length], fmpz_t u_maskA[length], fmpz_t u_maskB[length]);
#endif //GENERATE_INPUT_H_


generate_input.cpp
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#include <gmp.h>
#include <flint.h>
#include <fmpz.h>
#include <fmpz_poly.h>
#include <iostream>
#include <cstdlib>

#include "generate_input.hpp"	

void rand_code(fmpz_t (&u_code)[length]) {
	for(int i=0; i<length; i++) {
		fmpz_set_ui(u_code[i], rand()%2);
	}
}

void inv_code(fmpz_t u_code[], fmpz_t (&u_code_inv)[length]) {
	for(int i=0; i<length; i++) {
		fmpz_set_ui(u_code_inv[i], fmpz_is_zero(u_code[i]));
	}
}

//generate random mask
//bits in corresponding code that is erroneous are set to 0 in the mask, all other bits to 1
void rand_mask(fmpz_t (&u_mask)[length]) {
	int chance = 90; //chance in % that corresponding bit in code is valid

	for(int i=0; i<length; i++) {
		fmpz_set_ui(u_mask[i], (rand()%100)<chance);
	}
} 

void combined_masks(fmpz_t (&u_maskAB)[length], fmpz_t u_maskA[], fmpz_t u_maskB[]) {
	for(int i=0; i<length; i++) {
		fmpz_and(u_maskAB[i], u_maskA[i], u_maskB[i]);
	}
}


generate_test.cpp
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#include <gmp.h>
#include <flint.h>
#include <fmpz.h>
#include <fmpz_poly.h>
#include <iostream>
#include <cstdlib>

#include "generate_input.hpp"

using namespace std;

const int length;

int main() {
	length=20;

	//random generation of codeA
	fmpz_t u_codeA[length];
	for(int i=0; i<length; i++) {
		fmpz_init(u_codeA[i]);
	}

	rand_code(u_codeA);

	cout << "codeA : ";
	for(int i=0; i<length; i++) {
		fmpz_print(u_codeA[i]);
	}
	cout << endl;

	for(int i=0; i<length; i++) {
		fmpz_clear(u_codeA[i]);
	}

	//inverse of codeA
	fmpz_t u_codeA_inv[length];
	for(int i=0; i<length; i++) {
		fmpz_init(u_codeA_inv[i]);
	}

	inv_code(u_codeA, u_codeA_inv);
	
	cout << "inverse of codeA: ";
	for(int i=0; i<length; i++) {
		fmpz_print(u_codeA_inv[i]);
	}
	cout << endl;

	for(int i=0; i<length; i++) {
		fmpz_clear(u_codeA_inv[i]);
	}

	//random generation of codeB
	fmpz_t u_codeB[length];
	for(int i=0; i<length; i++) {
		fmpz_init(u_codeB[i]);
	}
	rand_code(u_codeB);
	cout << "codeB : ";
	for(int i=0; i<length; i++) {
		fmpz_print(u_codeB[i]);
	}
	cout << endl;

	for(int i=0; i<length; i++) {
		fmpz_clear(u_codeB[i]);
	}

	//inverse of codeB
	fmpz_t u_codeB_inv[length];
	for(int i=0; i<length; i++) {
		fmpz_init(u_codeB_inv[i]);
	}

	inv_code(u_codeB, u_codeB_inv);
	
	cout << "inverse of codeB: ";
	for(int i=0; i<length; i++) {
		fmpz_print(u_codeB_inv[i]);
	}
	cout << endl;

	for(int i=0; i<length; i++) {
		fmpz_clear(u_codeB_inv[i]);
	}

	//generation of maskA
	fmpz_t u_maskA[length];

	for(int i=0; i<length; i++) {
		fmpz_init(u_maskA[i]);
	}

	rand_mask(u_maskA);
	
	cout << "maskA: ";
	for(int i=0; i<length; i++) {
		fmpz_print(u_maskA[i]);
	}
	cout << endl;

	for(int i=0; i<length; i++) {
		fmpz_clear(u_maskA[i]);
	}

	//generation of maskB
	fmpz_t u_maskB[length];

	for(int i=0; i<length; i++) {
		fmpz_init(u_maskB[i]);
	}

	rand_mask(u_maskB);
	
	cout << "maskB: ";
	for(int i=0; i<length; i++) {
		fmpz_print(u_maskB[i]);
	}
	cout << endl;

	for(int i=0; i<length; i++) {
		fmpz_clear(u_maskB[i]);
	}

	//maskA ^ maskB
	fmpz_t u_maskAB[length];

	for(int i=0; i<length; i++) {
		fmpz_init(u_maskAB[i]);
	}

	combined_masks(u_maskAB, u_maskA, u_maskB);
	
	cout << "maskAB: ";
	for(int i=0; i<length; i++) {
		fmpz_print(u_maskAB[i]);
	}
	cout << endl;

	for(int i=0; i<length; i++) {
		fmpz_clear(u_maskAB[i]);
	}

	return 0;
}


I'm sorry for the very long codes. I guess there's no need to look at generate_test.cpp, except for the first 15 lines maybe.

I get the following errors:
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generate_input.hpp:15:40: error: variable or field "rand_code" declared 
void void rand_code(fmpz_t (&u_code)[length]);
generate_input.hpp:15:25: error: "u_code" was not declared in this scope 
void rand_code(fmpz_t (&u_code)[length]);
generate_input.hpp:15:31: functional cast to array type "fmpz_t {aka long int[1]}" 
void rand_code(fmpz_t (&u_code)[length]);
generate_input.hpp:16:59: error: array integer bound is not an integer constant before "]" token 
void inv_code(fmpz_t u_code[], fmpz_t (&u_code_inv)[length]);


These errors repeat for the other functions in generate_input.hpp. I guess the problem is in the arguments (&some_variable)[length], i.e. that length has not been initialized in the header file, but I don't see a solution as I'm a beginner and have only little knowledge of C++ (I'm more experienced in Java). I hope someone can help me, thanks a lot!
ne555 (10692)
change the prototypes so you send the size of the array
void rand_code(fmpz_t u_code[], size_t lenght);
Last edited on
hiephoi (11)
Thanks a lot! It works. :)
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