Memory leak using a class method - c++

Question

I have a problem with my program : I have a memory leak. I know it because when I look at the memory usage it never stop increasing, and then the program crash.
I have remarked that it happens because of this line (when I comment it there is no problem) :
replica[n].SetTempId(i+1); // FUITE MEMOIRE SUR CETTE LIGNE !!
I have checked that n is never bigger than the size of my array (which is a vector type, see below).
My class :
class Replica
{
/* All the functions in this class are in the 'public:' section */
public:
Replica();
~Replica();
void SetEnergy(double E);
void SetConfName(string config_name);
void SetTempId(int id_temp);
int GetTempId();
string GetConfName();
double GetEnergy();
void SetUp();
void SetDown();
void SetZero();
int GetUpDown();
/* All the attributes in this class are in the 'private:' section */
private:
double m_E; // The energy of the replica
string m_config_name; // The name of the config file associated
int m_id_temp; // The id of the temperature where the spin configuration is.
int m_updown;
};
The method
void Replica::SetTempId(int id_temp)
{
m_id_temp=id_temp;
}
I initialised my object like this :
vector<Replica> replica(n_temp); // we create a table that will contain information on the replicas.
The constructor :
Replica::Replica() : m_E(0), m_config_name(""), m_updown(0), m_id_temp(0)
{
}
How I initialize my vector :
for(int i=0; i<=n_temp-1 ; i++) // We write the object replica that will contain information on a given spin configuration.
{
string temp_folder="";
temp_folder= spin_folder + "/T=" + to_string(Tf[i]) + ".dat";
replica[i].SetEnergy(Ef[i]+i); // we save the energy of the config (to avoid to calculate it)
replica[i].SetConfName(temp_folder); // we save the name of the file where the config is saved (to avoid to have huge variables that will slow down the program)
replica[i].SetTempId(i);
replica[i].SetZero();
if(i==0)
replica[i].SetDown();
if(i==(n_temp-1))
replica[i].SetUp();
}
I am a beginner in C++ so it is probably a basic mistake.
Thank you for your help !
I have read your answers.
But it is hard to write a minimal code : I tried to delete some stuff but as soon as I delete lines it works.
In fact the problem is very "random", for example when I delete my line :
replica[n].SetTempId(i+1);
it works, but I can have this line not deleted but when I delete an other line of my code it will also works (I dont know if you see what I mean).
The bug is very hard to find because of this "randomness"...
I also can say that when it crash the program says me :
terminate called after throwing an instance of 'std::bad_alloc'
what(): std::bad_alloc
So, could you give me guess on what could cause this error (because I don't arrive to write the minimal code).
I don't do dynamic allocation on my code.
The structure of my code is like this :
while(Nsw_c<Nsw)
{
cout << "test1";
// a
// lot
// of
// code
// with some Nsw_c++
// and this cout at the end of the loop
cout << " Nsw_c : " << Nsw_c << endl << " i " << i << " compteur_bug " << compteur_bug;
}
cout << "test2";
It ALWAYS freeze on this cout above which is at the end of the loop.
I know this because neither test2 or test1 are displayed when it freezes and it is the next cout.
Nsw, Nsw_c, i are integers that are lower than 100 (they are not too big).
To be more precise, if I replace the cout just at the end of the loop by another cout like this :
cout << " test ";
It will also freeze at the same place.
In fact the program always freeze at the end of my while (juste before analysing the condition).
But Nsw and Nsw_c are not big at all so that's why it is strange.
I tried to replace the condition Nsw_c < Nsw just by "1" and it didn't freeze anymore. So it is probably a problem with the condition but both are just "normal" integers so...
Thanks !
I have launched gdb (i just learnt to use it) and i wrote :
catch throw std::bad_alloc
The debugger then do this (I don't know if it can help) :
not stopped at a C++ exception catchpoint
Catchpoint 1 (exception thrown), 0xb7f25290 in __cxa_throw () from /usr/lib/i386-linux-gnu/libstdc++.so.6