MESSAGE
| DATE | 2016-11-09 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [Learn] namespace and external files confusion
|
From learn-bounces-at-nylxs.com Wed Nov 9 10:37:29 2016
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From: Ruben Safir
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Subject: [Learn] namespace and external files confusion
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[This mail was also posted to comp.lang.c++.]
I'm doing this simple merge sort program and I'm tripping on this error
C++ call of overloaded =E2=80=98track(int*&, int&, int&, int*&)=E2=80=99 is=
ambiguous
I think this comes down to my confusion with namespace and I'm not
finding a good reference with C++
on namespace usage in different files
I have merge.h
#ifndef MSORT_INC
#define MSORT_INC
namespace merge{
int max(int x, int y);
void track(int* , int , int , int* );
int sort(int &input , int size);
}
#endif /* ----- #ifndef MSORT_INC ----- */
and merge.cpp
#include "msort.h"
using namespace merge;
int max(int x, int y){
int ret;
x>y ? ret=3Dx : ret=3Dy;
return ret;
}
void track(int* in, int left, int right, int* space)
{
int i =3D 0;
int length =3D right - left;
=
if(right =3D=3D left + 1){
return;
}
int mpt =3D length/2;
int pos1 =3D left;
int pos2 =3D left + mpt;
int pos3 =3D right;
//do the recursion now on the left and right branches
track(in, pos1, pos2, space);
track(in, pos2, pos3, space);
for(i =3D 0; i < length; i++)
{
if(pos1 < pos2 && ( pos2 =3D=3D pos3 || max(in[pos1], in[pos2]) =3D=3D
in[pos1]))
{
space[i] =3D in[pos1];
pos1++;
}
else{
space[i] =3D in[pos2];
pos2++;
}
}
/* transfer array segment */
for(i =3D left; i < right; i++)
{
in[i] =3D space[i - left];
}
}
And the error I get is
C++ call of overloaded =E2=80=98track(int*&, int&, int&, int*&)=E2=80=99 is=
ambiguous
gvim sees it right away as well
|| gcc -M *.cpp >make.deps
|| g++ -Wall -ggdb -c msort.cpp
|| msort.cpp: In function =E2=80=98void track(int*, int, int, int*)=E2=80=
=99:
msort.cpp|25 col 29| error: call of overloaded =E2=80=98track(int*&, int&, =
int&,
int*&)=E2=80=99 is ambiguous
|| track(in, pos1, pos2, space);
|| ^
msort.cpp|11 col 6| note: candidate: void track(int*, int, int, int*)
|| void track(int* in, int left, int right, int* space)
|| ^~~~~
msort.h|25 col 6| note: candidate: void merge::track(int*, int, int, int*)
|| void track(int* , int , int , int* );
|| ^~~~~
and it seems to identify the definition in the .cpp file as a separate
declaration than the declation in the .h file
What am I doing wrong?
-- =
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