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| #include <iostream>
struct fir_filter {
public:
fir_filter(): coeffs(NULL), num_coeffs(0), count(0) {}
~fir_filter() {
if (coeffs != NULL) {
delete[] coeffs;
}
}
public:
void add_coeff(short new_coeff) {
if (num_coeffs > 0) {
if (count < num_coeffs) {
coeffs[count] = new_coeff;
++count;
} else { // no realloc in C++, you must destroy and recreate
short* tmp;
num_coeffs += 2;
tmp = new short[num_coeffs]; // maybe test if is ok
for(size_t i=0; i < count; ++i) { tmp[i] = coeffs[i]; }
delete[] coeffs;
coeffs = tmp;
coeffs[count] = new_coeff;
++count;
}
} else {
coeffs = new short[4]; // maybe test if is ok
coeffs[0] = new_coeff;
count = 1;
num_coeffs = 4;
}
}
friend std::ostream& operator<< (std::ostream&, fir_filter const&);
public: // pour 1 structure, les membres sont souvent publiques
short* coeffs;
short num_coeffs;
private:
size_t count;
};
std::ostream& operator<< (std::ostream& os, fir_filter const& str) {
os << "[ ";
for(size_t i=0; i < str.count; ++i) { os << str.coeffs[i] << " "; }
os << "]";
return os;
}
int main()
{
fir_filter str;
std::cout << "init fir_filter: " << str << std::endl;
str.add_coeff((short) (32768 * -0.635640527595689));
str.add_coeff((short) (32768 * -0.20976263263201292));
str.add_coeff((short) (32768 * 0.6981598830670951));
str.add_coeff((short) (32768 * -0.20976263263201292));
str.add_coeff((short) (32768 * -0.635640527595689));
std::cout << "fir_filter: " << str << std::endl;
for(size_t i=0; i < 4; ++i) { str.add_coeff(32 * i); }
std::cout << "fir_filter: " << str << std::endl;
return 0;
} |
