limits.cpp

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#include <limits>      // for numeric_limits
#include <iostream>    // for cout
 
#include <examples.h>
 
 
std::ostream& operator<< (std::ostream &strm, std::float_denorm_style style)
{
    const char* name = "(unknown)";
 
    switch (style) {
    case std::denorm_absent: name = "std::denorm_absent"; break;
    case std::denorm_indeterminate: name = "std::denorm_indeterminate"; break;
    case std::denorm_present: name = "std::denorm_present"; break;
    }
 
    return strm << name;
}
 
 
template <class T>
void print_limits (std::ostream &strm, const char *tname, T)
{
#define PRINT_MEMBER(type, member)                     \
    strm << "    static " << type << " " #member " = "            \
         << std::numeric_limits<T>::member << ";\n"
 
    strm << "struct std::numeric_limits<" << tname << "> {\n";
 
    PRINT_MEMBER ("const bool", is_specialized);
 
    PRINT_MEMBER (tname, min ());
    PRINT_MEMBER (tname, max ());
 
    PRINT_MEMBER ("const int", digits);
    PRINT_MEMBER ("const int", digits10);
 
    PRINT_MEMBER ("const bool", is_signed);
    PRINT_MEMBER ("const bool", is_integer);
    PRINT_MEMBER ("const bool", is_exact);
    PRINT_MEMBER ("const int", radix);
 
    PRINT_MEMBER (tname, epsilon ());
    PRINT_MEMBER ("int", round_error ());
 
    PRINT_MEMBER ("const int", min_exponent);
    PRINT_MEMBER ("const int", min_exponent10);
    PRINT_MEMBER ("const int", max_exponent);
    PRINT_MEMBER ("const int", max_exponent10);
 
    PRINT_MEMBER ("const bool", has_infinity);
    PRINT_MEMBER ("const bool", has_quiet_NaN);
    PRINT_MEMBER ("const bool", has_signaling_NaN);
    PRINT_MEMBER ("const std::float_denorm_style", has_denorm);
 
    PRINT_MEMBER ("const bool", has_denorm_loss);
 
    PRINT_MEMBER (tname, infinity ());
    PRINT_MEMBER (tname, quiet_NaN ());
    PRINT_MEMBER (tname, signaling_NaN ());
    PRINT_MEMBER (tname, denorm_min ());
 
    PRINT_MEMBER ("const bool", is_iec559);
    PRINT_MEMBER ("const bool", is_bounded);
    PRINT_MEMBER ("const bool", is_modulo);
 
    PRINT_MEMBER ("const bool", traps);
    PRINT_MEMBER ("const bool", tinyness_before);
 
    PRINT_MEMBER ("const int", round_style);
 
    strm << "};\n";
}
 
 
int main ()
{
#define PRINT_LIMITS(T) print_limits (std::cout, #T, T ())
 
    // print bool values as "false" and "true"
    std::cout.setf (std::cout.boolalpha);
 
    // print the numeric limits for an integer type
    PRINT_LIMITS (int);
 
    std::cout << '\n';
 
    // print the numeric limits for a floating point type
    PRINT_LIMITS (double);
 
    return 0;
}