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Full Discussion: * vs &
Top Forums Programming * vs & Post 31028 by J.P on Thursday 31st of October 2002 08:23:52 AM
Old 10-31-2002
just a few pointers.. (Smilie)

Unlike pointers, you must immediately initialize a reference:

Quote:
int a = 5;
int* ptr; // OK!
int& x; // Error!
int& y = a; // OK!
Also remember that you can't use an operator to operate on the reference like you can do with pointers. An example...


Quote:
#include <iostream>
using std::cout;
using std::endl;

int main()
{
&nbsp; &nbsp; int a[4] = {12, 8, 543, 74};
&nbsp; &nbsp; int* ptr = &a[2];
&nbsp; &nbsp; int& ref = a[2];

&nbsp; &nbsp; ptr++;
&nbsp; &nbsp; ref++;&nbsp; &nbsp; //Nothing happens to the reference

&nbsp; &nbsp; cout << "reference: " << ref << endl;
&nbsp; &nbsp; cout << "pointer: " << *ptr << endl;
}
 

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TAU_GET_FUNC_VALS(3)					      TAU Instrumentation API					      TAU_GET_FUNC_VALS(3)

NAME
TAU_GET_FUNC_VALS - Gets detailed performance data for given functions SYNOPSIS
C/C++: TAU_GET_FUNC_VALS(const char **inFuncs, int numOfFuncs, double ***counterExclusiveValues, double ***counterInclusiveValues, int **numOfCalls, int **numOfSubRoutines, const char ***counterNames, int *numOfCounters, int tid); DESCRIPTION
It gets detailed performance data for the list of routines. The user specifies inFuncs and the number of routines; TAU then returns the other arguments with the performance data. counterExclusiveValues and counterInclusiveValues are two dimensional arrays: the first dimension is the routine id and the second is counter id. The value is indexed by these two dimensions. numCalls and numSubrs (or child routines) are one dimensional arrays. EXAMPLE
C/C++ : const char **inFuncs; /* The first dimension is functions, and the second dimension is counters */ double **counterExclusiveValues; double **counterInclusiveValues; int *numOfCalls; int *numOfSubRoutines; const char **counterNames; int numOfCouns; TAU_GET_FUNC_NAMES(functionList, numOfFunctions); /* We are only interested in the first two routines that are executing in this context. So, we allocate space for two routine names and get the performance data for these two routines at runtime. */ if (numOfFunctions >=2 ) { inFuncs = (const char **) malloc(sizeof(const char *) * 2); inFuncs[0] = functionList[0]; inFuncs[1] = functionList[1]; //Just to show consistency. TAU_DB_DUMP(); TAU_GET_FUNC_VALS(inFuncs, 2, counterExclusiveValues, counterInclusiveValues, numOfCalls, numOfSubRoutines, counterNames, numOfCouns); TAU_DUMP_FUNC_VALS_INCR(inFuncs, 2); cout << "@@@@@@@@@@@@@@@" << endl; cout << "The number of counters is: " << numOfCouns << endl; cout << "The first counter is: " << counterNames[0] << endl; cout << "The Exclusive value of: " << inFuncs[0] << " is: " << counterExclusiveValues[0][0] << endl; cout << "The numOfSubRoutines of: " << inFuncs[0] << " is: " << numOfSubRoutines[0] << endl; cout << "The Inclusive value of: " << inFuncs[1] << " is: " << counterInclusiveValues[1][0] << endl; cout << "The numOfCalls of: " << inFuncs[1] << " is: " << numOfCalls[1] << endl; cout << "@@@@@@@@@@@@@@@" << endl; } TAU_DB_DUMP_INCR(); SEE ALSO
TAU_GET_COUNTER_NAMES(3), TAU_GET_FUNC_NAMES(3), TAU_DUMP_FUNC_NAMES(3), TAU_DUMP_FUNC_VALS(3) 08/31/2005 TAU_GET_FUNC_VALS(3)
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