Stoi and stoll in C ++
I have #include (string) in my declarations at the top of the program, but when I try to run stoi (string) or stoll (string), I get the following error. I am running Cygwin g ++ v4.5.3.
Z: \ G \ CSCE 437> g ++ convert.cpp -o conv convert.cpp: In function
void transfer(std::string*)': convert.cpp:103:36: error:
stoll 'was not declared in this scope convert.cpp: 116: 35: error: `stoi' was not declared in this scope
fileTime[numRec] = stoll(result[0]); //converts string to Long Long
if(numRec = 0){
beginningTime = fileTime[0];
}
fileTime[numRec] = timeDiff;
hostName[numRec] = result[1];
diskNum[numRec] = stoi(result[2]);
type[numRec] = result[3];
offset[numRec] = stoi(result[4]);
fileSize[numRec] = stoi(result[5]);
responseTime[numRec] = stoi(result[6]);`
Where the result is an array of strings.
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These features are new in C ++ 11, and GCC only makes it available if you specify that version of the language using the command line option -std=c++11
(or -std=c++0x
in some older versions, I think this will be needed for version 4.5).
If you cannot use C ++ 11 for some reason, you can convert using string streams:
#include <sstream>
template <typename T> from_string(std::string const & s) {
std::stringstream ss(s);
T result;
ss >> result; // TODO handle errors
return result;
}
or, if you feel masochistic C functions such as those strtoll
declared in <cstring>
.
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