CODEWITHSUNDEEP
c++
user1876942
user1876942

Reputation: 1501

Namespace has not been declared

I have a namespace like:

HW.h

#include <select.h>
namespace Hw
{
    void setInput(uint8_t type, uint8_t input, ESelect select);
    void setParam(uint8_t param, ESelect select);
}

select.h

enum class ESelect
{
    Select0, 
    Select1, 
    Select2
}

Both of the above are in the same static library. I try to call this from another static library, like this.

Test.cpp

#include<HW.h>
#include<select.h>
Hw::setInput( 0, 2, ESelect::Select0 );

I get the error:

error: ‘Hw’ has not been declared
error: ‘ESelect’ has not been declared

What can be wrong?

Upvotes: 1

Views: 4034

Answers (2)

Paul R
Paul R

Reputation: 212929

Using #include <some_header.h> causes the compiler to search the system include directories before any user directories. Many *nix systems have a system header called select.h already, so you are probably including that instead of your own select.h.

Change all occurrences of:

#include <select.h>

to:

#include "select.h"

Ditto for #include <HW.h>.

Ideally you should not use system header names for your own headers, and you should always use "" for user headers and <> for system headers.

For future reference, a useful technique for debugging such problems is to use g++ -E ... or equivalent to see what headers are actually being included.

Upvotes: 4

Wojtek Surowka
Wojtek Surowka

Reputation: 20993

Looks like you do not have

#include "HW.h"

in Test.cpp

Upvotes: 3

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