linalg_util.h

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#ifndef MUI_LINALG_UTIL_H_
#define MUI_LINALG_UTIL_H_
 
#include <sstream>
#include <cassert>
#include <algorithm>
#include <cctype>
 
namespace mui {
namespace linalg {
 
// Function to left trim a string - helper function on matrix file I/O
inline std::string ltrim(const std::string &s) {
    const std::string WHITESPACE = " \n\r\t\f\v";
    std::string::size_type start = s.find_first_not_of(WHITESPACE);
    return (start == std::string::npos) ? "" : s.substr(start);
}
 
// Function to right trim a string - helper function on matrix file I/O
inline std::string rtrim(const std::string &s) {
    const std::string WHITESPACE = " \n\r\t\f\v";
    std::string::size_type end = s.find_last_not_of(WHITESPACE);
    return (end == std::string::npos) ? "" : s.substr(0, end + 1);
}
 
// Function to trim a string on both sides - helper function on matrix file I/O
inline std::string trim(const std::string &s) {
    return rtrim(ltrim(s));
}
 
// Function to convert the input string to all lowercase characters - helper function on matrix file I/O
inline std::string string_to_lower(const std::string &s) {
    std::string lower;
    std::transform(s.begin(), s.end(), std::back_inserter(lower), [](unsigned char c){ return std::tolower(c); });
    return lower;
}
 
// Function to convert the input string to all uppercase characters - helper function on matrix file I/O
inline std::string string_to_upper(const std::string &s) {
    std::string upper;
    std::transform(s.begin(), s.end(), std::back_inserter(upper), [](unsigned char c){ return std::toupper(c); });
    return upper;
}
 
} // linalg
} // mui
 
#endif /* MUI_LINALG_UTIL_H_ */