Question

Does anybody know of a convenient means of determining if a string value ‘qualifies’ as a floating-point number?

bool IsFloat( string MyString ) {    ... etc ...     return ... // true if float; false otherwise } 

Answer 1

If you can’t use a Boost library function, you can write your own isFloat function like this.

#include <string> #include <sstream>  bool isFloat( string myString ) {     std::istringstream iss(myString);     float f;     iss >> noskipws >> f; // noskipws considers leading whitespace invalid     // Check the entire string was consumed and if either failbit or badbit is set     return iss.eof() && !iss.fail();  }