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second attempt at a fix for the is_convertible g++ warning

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[SVN r8836]
This commit is contained in:
Jeremy Siek
2001-01-31 20:05:03 +00:00
parent 8ae858cc79
commit fd7d4efb22
1 changed files with 26 additions and 4 deletions
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30
include/boost/detail/type_traits.hpp
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@ -10,6 +10,10 @@
// see libs/utility/type_traits.htm
/* Release notes:
31 Jan 2001:
Fixed is_convertible warning for g++. Added specialization of
is_array to handle the const array case. Added parenthesis are
body of BOOST_IS_CLASS to prevent macro mistakes. (Jeremy Siek)
21 Jan 2001:
Fixed tests for long long to detect its presence on GCC (David Abrahams)
03 Oct 2000:
@ -474,9 +478,27 @@ struct is_convertible
private:
typedef char (&no)[1];
typedef char (&yes)[2];
# if defined(__BORLANDC__) || defined(__GNUC__)
// This workaround for Borland breaks the EDG C++ frontend,
// so we only use it for Borland.
// The workarounds for Borland and GNU C++ break the EDG C++ frontend,
// so we only use them for those compilers.
#if defined(__GNUC__)
struct accept_any {
template <class T> accept_any(const T&) { }
};
template <class T>
struct checker
{
// Need two arguments in the check functions to bias resolution
// towards the "yes" in the case when the From type has an implicit
// conversion operator defined for the To type, which would
// otherwise be an ambiguous situation.
static no check(accept_any, accept_any);
static yes check(T, From);
};
static From from;
public:
static const bool value =
sizeof( checker<To>::check(from, from) ) == sizeof(yes);
#elif defined(__BORLANDC__)
template <class T>
struct checker
{
@ -486,7 +508,7 @@ private:
static From from;
public:
static const bool value = sizeof( checker<To>::check(from) ) == sizeof(yes);
# else // not __BORLANDC__
# else // not __BORLANDC__ or __GNUC__
static no check(...);
static yes check(To);
static From from;