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isolate implementation-defined behavior in macros for easier portability

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[SVN r52577]
This commit is contained in:
Eric Niebler
2009-04-23 21:46:30 +00:00
parent 9708dbc454
commit dfc596a7bf
1 changed files with 26 additions and 8 deletions
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34
include/boost/mpl/string.hpp
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@@ -46,10 +46,28 @@
namespace boost { namespace mpl
{
#define BOOST_MPL_STRING_MAX_PARAMS BOOST_PP_DIV(BOOST_PP_ADD(BOOST_MPL_LIMIT_STRING_SIZE, 3), 4)
#define BOOST_MPL_STRING_MAX_PARAMS \
BOOST_PP_DIV(BOOST_PP_ADD(BOOST_MPL_LIMIT_STRING_SIZE, 3), 4)
#define BOOST_MPL_MULTICHAR_LENGTH(c) (std::size_t)((c>0xffffff)+(c>0xffff)+(c>0xff)+1)
#define BOOST_MPL_MULTICHAR_AT(c,i) (char)(0xff&(c>>(8*(BOOST_MPL_MULTICHAR_LENGTH(c)-(std::size_t)(i)-1))))
// Low-level bit-twiddling is done by macros. Any implementation-defined behavior of
// multi-character literals should be localized to these macros.
#define BOOST_MPL_MULTICHAR_LENGTH(c) \
(std::size_t)((c>0xffffff)+(c>0xffff)+(c>0xff)+1)
#define BOOST_MPL_MULTICHAR_AT(c,i) \
(char)(0xff&(c>>(8*(BOOST_MPL_MULTICHAR_LENGTH(c)-(std::size_t)(i)-1))))
#define BOOST_MPL_MULTICHAR_PUSH_BACK(c,i) \
(((c)<<8)|(unsigned char)(i))
#define BOOST_MPL_MULTICHAR_PUSH_FRONT(c,i) \
((((unsigned char)(i))<<(BOOST_MPL_MULTICHAR_LENGTH(c)*8))|(c))
#define BOOST_MPL_MULTICHAR_POP_BACK(c) \
((c)>>8)
#define BOOST_MPL_MULTICHAR_POP_FRONT(c) \
(((1<<((BOOST_MPL_MULTICHAR_LENGTH(c)-1)*8))-1)&(c))
struct string_tag;
struct string_iterator_tag;
@@ -173,7 +191,7 @@ namespace boost { namespace mpl
BOOST_PP_COMMA_IF(BOOST_PP_DEC(n)) \
(BOOST_PP_CAT(C,BOOST_PP_DEC(n))>0xffffff) \
?BOOST_PP_CAT(C,BOOST_PP_DEC(n)) \
:(BOOST_PP_CAT(C,BOOST_PP_DEC(n))<<8)|(unsigned char)Value::value \
:BOOST_MPL_MULTICHAR_PUSH_BACK(BOOST_PP_CAT(C,BOOST_PP_DEC(n)), Value::value) \
, (BOOST_PP_CAT(C,BOOST_PP_DEC(n))>0xffffff) \
?(char)Value::value \
:0 \
@@ -190,7 +208,7 @@ namespace boost { namespace mpl
typedef
mpl::string<
BOOST_PP_ENUM_PARAMS(BOOST_PP_DEC(BOOST_MPL_STRING_MAX_PARAMS), C)
, (BOOST_PP_CAT(C,BOOST_PP_DEC(BOOST_MPL_STRING_MAX_PARAMS))<<8)|(unsigned char)Value::value
, BOOST_MPL_MULTICHAR_PUSH_BACK(BOOST_PP_CAT(C,BOOST_PP_DEC(BOOST_MPL_STRING_MAX_PARAMS)), Value::value)
>
type;
};
@@ -214,7 +232,7 @@ namespace boost { namespace mpl
mpl::string< \
BOOST_PP_ENUM_PARAMS_Z(z, BOOST_PP_DEC(n), C) \
BOOST_PP_COMMA_IF(BOOST_PP_DEC(n)) \
(BOOST_PP_CAT(C,BOOST_PP_DEC(n))>>8) \
BOOST_MPL_MULTICHAR_POP_BACK(BOOST_PP_CAT(C,BOOST_PP_DEC(n))) \
> \
type; \
};
@@ -278,7 +296,7 @@ namespace boost { namespace mpl
{
typedef
mpl::string<
((((unsigned char)Value::value)<<(BOOST_MPL_MULTICHAR_LENGTH(C0)*8))|C0)
BOOST_MPL_MULTICHAR_PUSH_FRONT(C0, Value::value)
, BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)
>
type0;
@@ -324,7 +342,7 @@ namespace boost { namespace mpl
{
typedef
mpl::string<
(((1<<((BOOST_MPL_MULTICHAR_LENGTH(C0)-1)*8))-1)&C0)
BOOST_MPL_MULTICHAR_POP_FRONT(C0)
, BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)
>
type;