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#include <iostream>
using namespace std;
 
typedef struct {
	unsigned v;
} GPIO_typedef;
 
 
#define PORTA  ((GPIO_typedef*)0x04)
#define PORTB  ((GPIO_typedef*)0x08)
 
template< GPIO_typedef* T >
inline
unsigned getPortFlag()
{
	//static_assert(false, "not implemented for this target");
	return 0;
}
 
template<  >
inline
unsigned getPortFlag< PORTA >()
{
	return 1;
}
 
 
 
int main() {
	// your code goes here
 
	cout<<"Port A flag: "<<getPortFlag<PORTA>()<<"\n";
	cout<<"Port B flag: "<<getPortFlag<PORTB>()<<"\n";
	return 0;
}
 
 

prog.cpp:22:10: error: template-id ‘getPortFlag<4u>’ for ‘unsigned int getPortFlag()’ does not match any template declaration
 unsigned getPortFlag< PORTA >()
          ^~~~~~~~~~~~~~~~~~~~
prog.cpp:14:10: note: candidate is: template<GPIO_typedef* T> unsigned int getPortFlag()
 unsigned getPortFlag()
          ^~~~~~~~~~~
prog.cpp: In function ‘int main()’:
prog.cpp:32:44: error: no matching function for call to ‘getPortFlag()’
  cout<<"Port A flag: "<<getPortFlag<PORTA>()<<"\n";
                                            ^
prog.cpp:14:10: note: candidate: template<GPIO_typedef* T> unsigned int getPortFlag()
 unsigned getPortFlag()
          ^~~~~~~~~~~
prog.cpp:14:10: note:   template argument deduction/substitution failed:
prog.cpp:32:44: error: ‘4u’ is not a valid template argument for ‘GPIO_typedef*’ because it is not the address of a variable
  cout<<"Port A flag: "<<getPortFlag<PORTA>()<<"\n";
                                            ^
prog.cpp:33:44: error: no matching function for call to ‘getPortFlag()’
  cout<<"Port B flag: "<<getPortFlag<PORTB>()<<"\n";
                                            ^
prog.cpp:14:10: note: candidate: template<GPIO_typedef* T> unsigned int getPortFlag()
 unsigned getPortFlag()
          ^~~~~~~~~~~
prog.cpp:14:10: note:   template argument deduction/substitution failed:
prog.cpp:33:44: error: ‘8u’ is not a valid template argument for ‘GPIO_typedef*’ because it is not the address of a variable
  cout<<"Port B flag: "<<getPortFlag<PORTB>()<<"\n";
                                            ^

Standard output is empty