CODEWITHSUNDEEP
c++
Gio
Gio

Reputation: 3340

c++ - Init const class members, error: declaration does not declare anything

I'm trying to initialize const member variables in the member initialization list of the constructor.

I'm getting the following error:

error: declaration does not declare anything [-fpermissive]
    const uint32_t LEDS
          ^

My code:

#include <unistd.h>

class BaseAddr {
public:
    BaseAddr():
        LEDS      (0x41200000),
        SW1       (0x41210000), // switch 1
        SW2       (0x41220000), // switch 2
        AXI_BRAM  (0x40000000), // 128 registers
        AXI_DUMMY (0x43c00000)  // 16 registers, 4 lsb are connected with leds
    { /* nop */ }

    virtual ~BaseAddr() {}

    const uint32_t LEDS;
    const uint32_t SW1;
    const uint32_t SW2;

private:
    const uint32_t AXI_BRAM;
    const uint32_t AXI_DUMMY;
};

why is it giving this error?

Upvotes: 0

Views: 621

Answers (2)

Qaz
Qaz

Reputation: 61900

I'm going to say you have a macro LEDS somewhere defined as follows:

#define LEDS

Now your member declaration becomes:

const uint32_t;

This correctly triggers the error, as shown here.

Upvotes: 2

user3013022
user3013022

Reputation: 196

Its because header file is not included for uint32_t.

Use any of following header file stdint.h or cstdint

Upvotes: 0

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