Mastering the C++17 STL

Converting numbers to strings

Consider the following declarations:

    std::ostringstream oss;    std::string str;    char buffer[100];    int intvalue = 42;    float floatvalue = 3.14;    std::to_chars_result r;

To convert the intvalue integer to a string of digits, C++17 offers us the following options:

    snprintf(buffer, sizeof buffer, "%d", intvalue);      // available in <stdio.h>      // locale-independent (%d is unaffected by locales)      // non-allocating      // bases 8, 10, 16 only    oss << intvalue;    str = oss.str();      // available in <sstream>      // locale-problematic (thousands separator may be inserted)      // allocating; allocator-aware      // bases 8, 10, 16 only    str = std::to_string(intvalue);      // available since C++11 in <string>      // locale-independent (equivalent to %d) // allocating; ...