Bug #232
closed
Bug #80: Version 1.6 bugfixes
THaFormula copy constructor and assignment operators broken
Added by Ole Hansen about 7 years ago.
Updated about 7 years ago.
Description
Apparently I forgot to copy fVarDef, which is a vector<FVarDef_t>. Because the FVarDef_t structure in the vector sometimes manages resources itself, it needs a full set of copy/assignment/move operators for the vector to be happy (i.e. not crash).
I suspect I realized this when I rewrote THaFormula in late 2014 (the issue seems vaguely familiar), and I simply forgot to leave a "TODO" in the code.
- Status changed from New to Resolved
- % Done changed from 0 to 80
Copy/assignment now copy the fVarDef vector. Implemented copy/assignment/move for FVarDef_t.
Still needs testing.
Quick test on master branch:
double x = 12.34, y = 56.78;
gHaVars->Define("x",x);
gHaVars->Define("y",y);
THaFormula* f1 = new THaFormula("f1","x+y");
THaFormula* f2 = new THaFormula("f2","x*y");
f1->Eval()
(double) 69.120000
f2->Eval()
(double) 700.665200
f3 = *f2
(THaFormula &) Name: f2 Title: x*y
f3.Print("FULL")
f2 : x*y Ndim= 1, Npar= 0, Noper= 3
fExpr[0] = x action = 150 action param = 0
fExpr[1] = y action = 150 action param = 1
fExpr[2] = * action = 3 action param = 0
Optimized expression
fExpr[0] = x action = 150 action param = 0
fExpr[1] = y action = 150 action param = 1
fExpr[2] = * action = 3 action param = 0
f3.Eval()
(double) 700.665200
All this is exactly as expected.
Now a crude check for memory leaks - just observe the process with top while it is running.
for( int i = 0; i<1000000; ++i ) { f3 = *f1; f3 = *f2; }
I should run this through
valgrind to be sure.
- Status changed from Resolved to Closed
- % Done changed from 80 to 100
Running more tests, this time with subformulas for which there are actual internal memory allocations:
vector<int> ia { -1,0,1,2,3,4,5,6,7,8,9,10 };
gHaVars->Define("ia",ia);
auto f1 = new THaFormula("f1","Sum$(2*ia)");
auto f2 = new THaFormula("f2","Mean$(ia+ia-3*ia)");
f1->Eval()
(double) 108.000000
f2->Eval()
(double) -4.500000
auto f3 = new THaFormula(*f1);
f3->Eval()
(double) 108.000000
for( int i = 0; i<1000000; ++i ) { *f3 = *f1; *f3 = *f2; }
Results as expected. No change in memory usage whatsoever. Looks like this works. Closing issue.
Also available in: Atom
PDF