Type Casting File Input to Vector Type in C++ -

Type Casting File Input to Vector Type in C++ -

in main function, there various vectors of different template types(float, int, char*). function called read in formatted input different files fill each vector. problem coming type conversion since

v.push_back((t)(pchar));

does not converting char* float(presumably because of decimal point).

question: there way right conversions regardless of info type long input file appropriate? (i've considered typeid(); not sold on using it)

template <class t> void get_list(vector <t> & v, const char * path) { fstream file; const char delim[1]{' '}; char line[512]; char * pchar; file.open(path, ios_base::in); if (file.is_open()) { while (!file.eof()) { file.getline(line, 512); pchar = strtok(line, delim); while (pchar != null) { v.push_back(pchar); pchar = strtok(null, delim); } } file.close(); } else { cout << "an error has occurred while opening specified file." << endl; } }

this homework problem not pertain straight objective of assignment. assignment on heaps info structs/algorithm class.

indeed, can't cast string arbitrary type, you'll need code parse , interpret contents of string. i/o library has string streams that:

std::stringstream ss(pchar); t value; ss >> value; v.push_back(value);

this work types have >> overload, including built-in numeric types float.

alternatively, might want rid of nasty c-style tokenisation:

t value; while (file >> value) { v.push_back(value); }

or

std::copy( std::istream_iterator<t>(file), std::istream_iterator<t>(), std::back_inserter(v));

at least, alter loop to

while (file.getline(line, 512))

checking file status after reading line, don't process final line twice.

c++ casting