What causes the error #18 expected a ")" on a MSP430 - c++

Question

Compiling the following C++14 code for a MSP430 using TI Code Composer I got the following errors:
subdir_rules.mk:14: recipe for target 'main.obj' failed
"Interface.h", line 75: error #18: expected a ")"
"Derived.h", line 91: error #18: expected a ")"
This is for the following code structure in which the Interface.h class is a library which compiles fine for STM32 targets.
#include <cstdint>
namespace NS
{
class Interface
{
public:
// Other pure virtual functions such as:
virtual void advance() = 0;
// This is the problem function
virtual void advance(const uint32_t N) = 0;
};
}
Next in the MSP430 project the interface is used in multiple objects. This is one example of multiple implementations, they all give the same error.
#include "Interface.h"
class Derived : public ::NS::Interface
{
public:
// Overriding virtual functions with implementations in cpp file.
void advance() override;
// The problematic function
void advance(const uint32_t N) override;
private:
uint32_t index;
};
The cpp file:
#include "Derived.h"
Derived::advance()
{
++index;
}
Derived::advance(const uint32_t N)
{
index += N;
}
Now inspecting the code for any "funny" characters like Greek question marks did not yield any result. I tried replacing the text, typing it again etc to no result
Commenting out the functions advance(const uint32_t N) resolves the problem so it is not something else in the file.
What could cause this problem?

Answer 1

The problem was indeed as #Clifford mentioned. N was already defined somewhere in the MSP430 code. Renaming Derived::advance(const uint32_t N) to Derived::advance(const uint32_t N_bytes) solves the problem.