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- /* boost limits_test.cpp test your <limits> file for important
- *
- * Copyright Jens Maurer 2000
- * Distributed under the Boost Software License, Version 1.0. (See
- * accompanying file LICENSE_1_0.txt or copy at
- * http://www.boost.org/LICENSE_1_0.txt)
- *
- * $Id$
- */
- #include <boost/limits.hpp>
- #include <boost/detail/lightweight_main.hpp>
- #include <boost/core/lightweight_test.hpp>
- #include <iostream>
- /*
- * General portability note:
- * MSVC mis-compiles explicit function template instantiations.
- * For example, f<A>() and f<B>() are both compiled to call f<A>().
- * BCC is unable to implicitly convert a "const char *" to a std::string
- * when using explicit function template instantiations.
- *
- * Therefore, avoid explicit function template instantiations.
- */
- #if defined(BOOST_MSVC) && (BOOST_MSVC <= 1300)
- template<typename T> inline T make_char_numeric_for_streaming(T x) { return x; }
- namespace fix{
- inline int make_char_numeric_for_streaming(char c) { return c; }
- inline int make_char_numeric_for_streaming(signed char c) { return c; }
- inline int make_char_numeric_for_streaming(unsigned char c) { return c; }
- }
- using namespace fix;
- # if defined(_YVALS) && !defined(_CPPLIB_VER) && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
- // fix for missing operator<< in original Dinkumware lib:
- std::ostream& operator<<(std::ostream& os, __int64 i )
- {
- char buf[80];
- sprintf(buf,"%I64d", i );
- os << buf;
- return os;
- }
- std::ostream& operator<<(std::ostream& os, unsigned __int64 i )
- {
- char buf[80];
- sprintf(buf,"%I64u", i );
- os << buf;
- return os;
- }
- # endif
- #else
- template<typename T> inline T make_char_numeric_for_streaming(T x) { return x; }
- inline int make_char_numeric_for_streaming(char c) { return c; }
- inline int make_char_numeric_for_streaming(signed char c) { return c; }
- inline int make_char_numeric_for_streaming(unsigned char c) { return c; }
- #endif
- #if (defined(_GLIBCPP_VERSION) || defined(_GLIBCXX_VERSION)) \
- && defined(BOOST_HAS_LONG_LONG) \
- && !defined(_GLIBCPP_USE_LONG_LONG) \
- && !defined(_GLIBCXX_USE_LONG_LONG)
- //
- // Some libstdc++ versions have numeric_limits<long long> but no
- // iostream support for long long. TODO, find a better fix!!
- //
- std::ostream& operator<<(std::ostream& os, long long i )
- {
- return os << static_cast<long double>(i);
- }
- std::ostream& operator<<(std::ostream& os, unsigned long long i )
- {
- return os << static_cast<long double>(i);
- }
- #endif
- template<class T>
- void test_integral_limits(const T &, const char * msg)
- {
- typedef std::numeric_limits<T> lim;
- std::cout << "Testing " << msg
- << " (size " << sizeof(T) << ")"
- << " min: " << make_char_numeric_for_streaming((lim::min)())
- << ", max: " << make_char_numeric_for_streaming((lim::max)())
- << std::endl;
- BOOST_TEST(static_cast<bool>(lim::is_specialized));
- BOOST_TEST(static_cast<bool>(lim::is_integer));
- // BOOST_TEST(lim::is_modulo);
- BOOST_TEST(static_cast<bool>((lim::min)() < (lim::max)()));
- }
- template <class T>
- void print_hex_val(T t, const char* name)
- {
- const unsigned char* p = (const unsigned char*)&t;
- std::cout << "hex value of " << name << " is: ";
- for (unsigned int i = 0; i < sizeof(T); ++i) {
- if(p[i] <= 0xF)
- std::cout << "0";
- std::cout << std::hex << (int)p[i];
- }
- std::cout << std::dec << std::endl;
- }
- template<class T>
- void test_float_limits(const T &, const char * msg)
- {
- std::cout << "\nTesting " << msg << std::endl;
- typedef std::numeric_limits<T> lim;
- BOOST_TEST(static_cast<bool>(lim::is_specialized));
- BOOST_TEST(static_cast<bool>(!lim::is_modulo));
- BOOST_TEST(static_cast<bool>(!lim::is_integer));
- BOOST_TEST(static_cast<bool>(lim::is_signed));
- const T infinity = lim::infinity();
- const T qnan = lim::quiet_NaN();
- const T snan = lim::signaling_NaN();
- std::cout << "IEEE-compatible: " << lim::is_iec559
- << ", traps: " << lim::traps
- << ", bounded: " << lim::is_bounded
- << ", exact: " << lim::is_exact << '\n'
- << "min: " << (lim::min)() << ", max: " << (lim::max)() << '\n'
- << "infinity: " << infinity << ", QNaN: " << qnan << '\n';
- print_hex_val((lim::max)(), "max");
- print_hex_val(infinity, "infinity");
- print_hex_val(qnan, "qnan");
- print_hex_val(snan, "snan");
- BOOST_TEST((lim::max)() > 1000);
- BOOST_TEST((lim::min)() > 0);
- BOOST_TEST((lim::min)() < 0.001);
- BOOST_TEST(lim::epsilon() > 0);
- if(lim::is_iec559) {
- BOOST_TEST(static_cast<bool>(lim::has_infinity));
- BOOST_TEST(static_cast<bool>(lim::has_quiet_NaN));
- BOOST_TEST(static_cast<bool>(lim::has_signaling_NaN));
- } else {
- std::cout << "Does not claim IEEE conformance" << std::endl;
- }
- if(lim::has_infinity) {
- // Make sure those values are not 0 or similar nonsense.
- // Infinity must compare as if larger than the maximum representable value.
- BOOST_TEST(infinity > (lim::max)());
- BOOST_TEST(-infinity < -(lim::max)());
- } else {
- std::cout << "Does not have infinity" << std::endl;
- }
- if(lim::has_quiet_NaN) {
- // NaNs shall always compare "false" when compared for equality
- // If one of these fail, your compiler may be optimizing incorrectly,
- // or the standard library is incorrectly configured.
- BOOST_TEST(! (qnan == 42));
- BOOST_TEST(qnan != 42);
- if(lim::is_iec559)
- {
- BOOST_TEST(! (qnan == qnan));
- BOOST_TEST(qnan != qnan);
- }
- // The following tests may cause arithmetic traps.
- // BOOST_TEST(! (qnan < 42));
- // BOOST_TEST(! (qnan > 42));
- // BOOST_TEST(! (qnan <= 42));
- // BOOST_TEST(! (qnan >= 42));
- } else {
- std::cout << "Does not have QNaN" << std::endl;
- }
- }
- int cpp_main(int, char*[])
- {
- test_integral_limits(bool(), "bool");
- test_integral_limits(char(), "char");
- typedef signed char signed_char;
- test_integral_limits(signed_char(), "signed char");
- typedef unsigned char unsigned_char;
- test_integral_limits(unsigned_char(), "unsigned char");
- test_integral_limits(wchar_t(), "wchar_t");
- test_integral_limits(short(), "short");
- typedef unsigned short unsigned_short;
- test_integral_limits(unsigned_short(), "unsigned short");
- test_integral_limits(int(), "int");
- typedef unsigned int unsigned_int;
- test_integral_limits(unsigned_int(), "unsigned int");
- test_integral_limits(long(), "long");
- typedef unsigned long unsigned_long;
- test_integral_limits(unsigned_long(), "unsigned long");
- #if defined(BOOST_HAS_LONG_LONG)
- test_integral_limits(::boost::long_long_type(), "long long");
- test_integral_limits(::boost::ulong_long_type(), "unsigned long long");
- #endif
- #ifdef BOOST_HAS_MS_INT64
- typedef __int64 long_long2;
- test_integral_limits(long_long2(), "__int64");
- typedef unsigned __int64 unsigned_long_long2;
- test_integral_limits(unsigned_long_long2(), "unsigned __int64");
- #endif
- test_float_limits(float(), "float");
- test_float_limits(double(), "double");
- typedef long double long_double;
- test_float_limits(long_double(), "long double");
- // Some compilers don't pay attention to std:3.6.1/5 and issue a
- // warning here if "return 0;" is omitted.
- return boost::report_errors();
- }
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