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