Can this be solved with templates?

[Eric Lilja]

Hello, I wrote a simple class that can measure the time it takes to
call a function using some platform dependent code. The actual
measurement function in this timer class has this signature:

typedef void (*FunctionPointer)(const long double *, const long double
*, std::size_t);

double TimerClass::time_function(FunctionPointer fptr, const long
double *x, const long double *y, std::size_t size)

The arguments following the function pointer is those that are to be
sent to the function that is measured...so this class is not reusable
at all, it only works for functions taking those arguments...can I do
some template magic here be able to use it with all functions, no
matter their argument lists? Or maybe something else?

- Eric

 

[dasjotre]

Hello, I wrote a simple class that can measure the time it takes to
call a function using some platform dependent code. The actual
measurement function in this timer class has this signature:

typedef void (*FunctionPointer)(const long double *, const long double
*, std::size_t);

double TimerClass::time_function(FunctionPointer fptr, const long
double *x, const long double *y, std::size_t size)

The arguments following the function pointer is those that are to be
sent to the function that is measured...so this class is not reusable
at all, it only works for functions taking those arguments...can I do
some template magic here be able to use it with all functions, no
matter their argument lists? Or maybe something else?

you could use boost::function/bind library

template<class F>
double time_function(F f)
{
// your timing here
f();
}

// 0 arity
void fun();
time_function(&fun);

// 1 arity
void fun1(int);
// time call fun1(5)
time_function(boost::bind(&fun, 5));

// member function
struct A
{
void fun();
void fun1(int);
};

A a;
// time call a.fun()
time_function(boost::bind(&A::fun, &a));

// time call a.fun1(5)
time_function(boost::bind(&A::fun, &a, 5));

D.

 

[dasjotre]

// time call a.fun1(5)
time_function(boost::bind(&A::fun, &a, 5));

that should be
time_function(boost::bind(&A::fun1, &a, 5));