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ircd: Refactor lex_cast impl to boost spirit rather than boost conversions.

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This commit is contained in:
Jason Volk 2021-03-01 14:42:54 -08:00
parent 29b99dcf4d
commit cc9df943a7
3 changed files with 705 additions and 339 deletions
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19
include/ircd/lex_cast.h
View file

@ -18,22 +18,31 @@ namespace ircd
{
IRCD_EXCEPTION_HIDENAME(ircd::error, bad_lex_cast)
// Test if lex_cast will succeed
template<class T> bool lex_castable(const string_view &) noexcept = delete;
// Convert from ascii to integral
template<class T> T lex_cast(std::string &);
template<class T> T lex_cast(const std::string &);
template<class T> T lex_cast(const std::string_view &);
template<class T> T lex_cast(const string_view &);
// User supplied destination buffer
// Convert from integral to ascii (user supplied destination buffer)
template<class T> string_view lex_cast(T, const mutable_buffer &buf);
// Circular static thread_local buffer
extern const size_t LEX_CAST_BUFS;
extern const size_t LEX_CAST_BUFSIZE;
// Convert from integral to ascii (circular internal thread_local buffer)
template<class T> string_view lex_cast(const T &t);
}
// Internal convenience ring buffer related
namespace ircd
{
constexpr size_t LEX_CAST_BUFS {256}, LEX_CAST_BUFSIZE {64};
extern thread_local char lex_cast_buf[LEX_CAST_BUFS][LEX_CAST_BUFSIZE];
extern thread_local uint8_t lex_cast_buf_head;
}
// Explicit linkages
namespace ircd
{
template<> bool lex_castable<std::string>(const string_view &) noexcept; // stub always true
@ -113,7 +122,7 @@ template<class T>
inline ircd::string_view
ircd::lex_cast(const T &t)
{
return lex_cast<T>(t, null_buffer);
return lex_cast<T>(t, lex_cast_buf[lex_cast_buf_head++]);
}
/// Conversion to an std::string creates a copy when the input is a

3
ircd/Makefile.am
View file

@ -283,7 +283,8 @@ js.lo: AM_CPPFLAGS := @JS_CPPFLAGS@ ${AM_CPPFLAGS}
endif
json.lo: AM_CPPFLAGS := ${SPIRIT_UNIT_CPPFLAGS} ${AM_CPPFLAGS}
json.lo: AM_CXXFLAGS := ${SPIRIT_UNIT_CXXFLAGS} ${AM_CXXFLAGS}
lex_cast.lo: AM_CPPFLAGS := @BOOST_CPPFLAGS@ ${AM_CPPFLAGS}
lex_cast.lo: AM_CPPFLAGS := ${SPIRIT_UNIT_CPPFLAGS} ${AM_CPPFLAGS}
lex_cast.lo: AM_CXXFLAGS := ${SPIRIT_UNIT_CXXFLAGS} ${AM_CXXFLAGS}
if OPENCL
cl.lo: AM_CPPFLAGS := @OPENCL_CPPFLAGS@ ${AM_CPPFLAGS}
endif

1022
ircd/lex_cast.cc
View file

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