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Rationalized conversion registry

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Better error reporting


[SVN r14412]
This commit is contained in:
Dave Abrahams
2002-07-11 21:04:33 +00:00
parent c0ecde90bc
commit b8aaf7d7b1
13 changed files with 241 additions and 233 deletions
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67
src/converter/from_python.cpp
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@@ -14,10 +14,12 @@
namespace boost { namespace python { namespace converter {
BOOST_PYTHON_DECL rvalue_from_python_stage1_data find(
BOOST_PYTHON_DECL rvalue_from_python_stage1_data rvalue_from_python_stage1(
PyObject* source
, rvalue_from_python_registration const* chain)
, from_python_registration const& converters)
{
rvalue_from_python_chain const* chain = converters.rvalue_chain;
rvalue_from_python_stage1_data data;
data.convertible = 0;
for (;chain != 0; chain = chain->next)
@@ -33,23 +35,54 @@ BOOST_PYTHON_DECL rvalue_from_python_stage1_data find(
return data;
}
BOOST_PYTHON_DECL void* get_lvalue_from_python(
PyObject* source
, from_python_registration const& converters)
{
lvalue_from_python_chain const* chain = converters.lvalue_chain;
for (;chain != 0; chain = chain->next)
{
void* r = chain->convert(source);
if (r != 0)
return r;
}
return 0;
}
namespace
{
// Prevent looping in implicit conversions. This could/should be
// much more efficient, but will work for now.
typedef std::vector<rvalue_from_python_registration const*> visited_t;
typedef std::vector<rvalue_from_python_chain const*> visited_t;
static visited_t visited;
inline bool visit(rvalue_from_python_chain const* chain)
{
visited_t::iterator const p = std::lower_bound(visited.begin(), visited.end(), chain);
if (p != visited.end() && *p == chain)
return false;
visited.insert(p, chain);
return true;
}
void unvisit(rvalue_from_python_chain const* chain)
{
visited_t::iterator const p = std::lower_bound(visited.begin(), visited.end(), chain);
assert(p != visited.end());
visited.erase(p);
}
}
BOOST_PYTHON_DECL rvalue_from_python_registration const* find_chain(
BOOST_PYTHON_DECL rvalue_from_python_chain const* implicit_conversion_chain(
PyObject* source
, rvalue_from_python_registration const* chain)
, from_python_registration const& converters)
{
visited_t::iterator p = std::lower_bound(visited.begin(), visited.end(), chain);
if (p != visited.end() && *p == chain)
rvalue_from_python_chain const* chain = converters.rvalue_chain;
if (!visit(chain))
return 0;
visited.insert(p, chain);
try
{
for (;chain != 0; chain = chain->next)
@@ -60,25 +93,11 @@ BOOST_PYTHON_DECL rvalue_from_python_registration const* find_chain(
}
catch(...)
{
visited.erase(p);
unvisit(chain);
throw;
}
p = std::lower_bound(visited.begin(), visited.end(), chain);
visited.erase(p);
unvisit(chain);
return chain;
}
BOOST_PYTHON_DECL void* find(
PyObject* source
, lvalue_from_python_registration const* chain)
{
for (;chain != 0; chain = chain->next)
{
void* r = chain->convert(source);
if (r != 0)
return r;
}
return 0;
}
}}} // namespace boost::python::converter