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Rocket.Chat.ReactNative/ios/Pods/boost-for-react-native/boost/compute/function.hpp

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//---------------------------------------------------------------------------//
// Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
//
// Distributed under the Boost Software License, Version 1.0
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
//
// See http://boostorg.github.com/compute for more information.
//---------------------------------------------------------------------------//
#ifndef BOOST_COMPUTE_FUNCTION_HPP
#define BOOST_COMPUTE_FUNCTION_HPP
#include <map>
#include <string>
#include <sstream>
#include <vector>
#include <boost/assert.hpp>
#include <boost/config.hpp>
#include <boost/function_types/parameter_types.hpp>
#include <boost/preprocessor/repetition.hpp>
#include <boost/mpl/for_each.hpp>
#include <boost/mpl/size.hpp>
#include <boost/mpl/transform.hpp>
#include <boost/static_assert.hpp>
#include <boost/tuple/tuple.hpp>
#include <boost/type_traits/add_pointer.hpp>
#include <boost/type_traits/function_traits.hpp>
#include <boost/compute/cl.hpp>
#include <boost/compute/config.hpp>
#include <boost/compute/type_traits/type_name.hpp>
namespace boost {
namespace compute {
namespace detail {
template<class ResultType, class ArgTuple>
class invoked_function
{
public:
typedef ResultType result_type;
BOOST_STATIC_CONSTANT(
size_t, arity = boost::tuples::length<ArgTuple>::value
);
invoked_function(const std::string &name,
const std::string &source)
: m_name(name),
m_source(source)
{
}
invoked_function(const std::string &name,
const std::string &source,
const std::map<std::string, std::string> &definitions)
: m_name(name),
m_source(source),
m_definitions(definitions)
{
}
invoked_function(const std::string &name,
const std::string &source,
const ArgTuple &args)
: m_name(name),
m_source(source),
m_args(args)
{
}
invoked_function(const std::string &name,
const std::string &source,
const std::map<std::string, std::string> &definitions,
const ArgTuple &args)
: m_name(name),
m_source(source),
m_definitions(definitions),
m_args(args)
{
}
std::string name() const
{
return m_name;
}
std::string source() const
{
return m_source;
}
const std::map<std::string, std::string>& definitions() const
{
return m_definitions;
}
const ArgTuple& args() const
{
return m_args;
}
private:
std::string m_name;
std::string m_source;
std::map<std::string, std::string> m_definitions;
ArgTuple m_args;
};
} // end detail namespace
/// \class function
/// \brief A function object.
template<class Signature>
class function
{
public:
/// \internal_
typedef typename
boost::function_traits<Signature>::result_type result_type;
/// \internal_
BOOST_STATIC_CONSTANT(
size_t, arity = boost::function_traits<Signature>::arity
);
/// \internal_
typedef Signature signature;
/// Creates a new function object with \p name.
function(const std::string &name)
: m_name(name)
{
}
/// Destroys the function object.
~function()
{
}
/// \internal_
std::string name() const
{
return m_name;
}
/// \internal_
void set_source(const std::string &source)
{
m_source = source;
}
/// \internal_
std::string source() const
{
return m_source;
}
/// \internal_
void define(std::string name, std::string value = std::string())
{
m_definitions[name] = value;
}
/// \internal_
detail::invoked_function<result_type, boost::tuple<> >
operator()() const
{
BOOST_STATIC_ASSERT_MSG(
arity == 0,
"Non-nullary function invoked with zero arguments"
);
return detail::invoked_function<result_type, boost::tuple<> >(
m_name, m_source, m_definitions
);
}
/// \internal_
template<class Arg1>
detail::invoked_function<result_type, boost::tuple<Arg1> >
operator()(const Arg1 &arg1) const
{
BOOST_STATIC_ASSERT_MSG(
arity == 1,
"Non-unary function invoked one argument"
);
return detail::invoked_function<result_type, boost::tuple<Arg1> >(
m_name, m_source, m_definitions, boost::make_tuple(arg1)
);
}
/// \internal_
template<class Arg1, class Arg2>
detail::invoked_function<result_type, boost::tuple<Arg1, Arg2> >
operator()(const Arg1 &arg1, const Arg2 &arg2) const
{
BOOST_STATIC_ASSERT_MSG(
arity == 2,
"Non-binary function invoked with two arguments"
);
return detail::invoked_function<result_type, boost::tuple<Arg1, Arg2> >(
m_name, m_source, m_definitions, boost::make_tuple(arg1, arg2)
);
}
/// \internal_
template<class Arg1, class Arg2, class Arg3>
detail::invoked_function<result_type, boost::tuple<Arg1, Arg2, Arg3> >
operator()(const Arg1 &arg1, const Arg2 &arg2, const Arg3 &arg3) const
{
BOOST_STATIC_ASSERT_MSG(
arity == 3,
"Non-ternary function invoked with three arguments"
);
return detail::invoked_function<result_type, boost::tuple<Arg1, Arg2, Arg3> >(
m_name, m_source, m_definitions, boost::make_tuple(arg1, arg2, arg3)
);
}
private:
std::string m_name;
std::string m_source;
std::map<std::string, std::string> m_definitions;
};
/// Creates a function object given its \p name and \p source.
///
/// \param name The function name.
/// \param source The function source code.
///
/// \see BOOST_COMPUTE_FUNCTION()
template<class Signature>
inline function<Signature>
make_function_from_source(const std::string &name, const std::string &source)
{
function<Signature> f(name);
f.set_source(source);
return f;
}
namespace detail {
// given a string containing the arguments declaration for a function
// like: "(int a, const float b)", returns a vector containing the name
// of each argument (e.g. ["a", "b"]).
inline std::vector<std::string> parse_argument_names(const char *arguments)
{
BOOST_ASSERT_MSG(
arguments[0] == '(' && arguments[std::strlen(arguments)-1] == ')',
"Arguments should start and end with parentheses"
);
std::vector<std::string> args;
size_t last_space = 0;
size_t skip_comma = 0;
for(size_t i = 1; i < std::strlen(arguments) - 2; i++){
const char c = arguments[i];
if(c == ' '){
last_space = i;
}
else if(c == ',' && !skip_comma){
std::string name(
arguments + last_space + 1, i - last_space - 1
);
args.push_back(name);
}
else if(c == '<'){
skip_comma++;
}
else if(c == '>'){
skip_comma--;
}
}
std::string last_argument(
arguments + last_space + 1, std::strlen(arguments) - last_space - 2
);
args.push_back(last_argument);
return args;
}
struct signature_argument_inserter
{
signature_argument_inserter(std::stringstream &s_, const char *arguments, size_t last)
: s(s_)
{
n = 0;
m_last = last;
m_argument_names = parse_argument_names(arguments);
BOOST_ASSERT_MSG(
m_argument_names.size() == last,
"Wrong number of arguments"
);
}
template<class T>
void operator()(const T*)
{
s << type_name<T>() << " " << m_argument_names[n];
if(n+1 < m_last){
s << ", ";
}
n++;
}
size_t n;
size_t m_last;
std::stringstream &s;
std::vector<std::string> m_argument_names;
};
template<class Signature>
inline std::string make_function_declaration(const char *name, const char *arguments)
{
typedef typename
boost::function_traits<Signature>::result_type result_type;
typedef typename
boost::function_types::parameter_types<Signature>::type parameter_types;
typedef typename
mpl::size<parameter_types>::type arity_type;
std::stringstream s;
s << "inline " << type_name<result_type>() << " " << name;
s << "(";
if(arity_type::value > 0){
signature_argument_inserter i(s, arguments, arity_type::value);
mpl::for_each<
typename mpl::transform<parameter_types, boost::add_pointer<mpl::_1>
>::type>(i);
}
s << ")";
return s.str();
}
struct argument_list_inserter
{
argument_list_inserter(std::stringstream &s_, const char first, size_t last)
: s(s_)
{
n = 0;
m_last = last;
m_name = first;
}
template<class T>
void operator()(const T*)
{
s << type_name<T>() << " " << m_name++;
if(n+1 < m_last){
s << ", ";
}
n++;
}
size_t n;
size_t m_last;
char m_name;
std::stringstream &s;
};
template<class Signature>
inline std::string generate_argument_list(const char first = 'a')
{
typedef typename
boost::function_types::parameter_types<Signature>::type parameter_types;
typedef typename
mpl::size<parameter_types>::type arity_type;
std::stringstream s;
s << '(';
if(arity_type::value > 0){
argument_list_inserter i(s, first, arity_type::value);
mpl::for_each<
typename mpl::transform<parameter_types, boost::add_pointer<mpl::_1>
>::type>(i);
}
s << ')';
return s.str();
}
// used by the BOOST_COMPUTE_FUNCTION() macro to create a function
// with the given signature, name, arguments, and source.
template<class Signature>
inline function<Signature>
make_function_impl(const char *name, const char *arguments, const char *source)
{
std::stringstream s;
s << make_function_declaration<Signature>(name, arguments);
s << source;
return make_function_from_source<Signature>(name, s.str());
}
} // end detail namespace
} // end compute namespace
} // end boost namespace
/// Creates a function object with \p name and \p source.
///
/// \param return_type The return type for the function.
/// \param name The name of the function.
/// \param arguments A list of arguments for the function.
/// \param source The OpenCL C source code for the function.
///
/// The function declaration and signature are automatically created using
/// the \p return_type, \p name, and \p arguments macro parameters.
///
/// The source code for the function is interpreted as OpenCL C99 source code
/// which is stringified and passed to the OpenCL compiler when the function
/// is invoked.
///
/// For example, to create a function which squares a number:
/// \code
/// BOOST_COMPUTE_FUNCTION(float, square, (float x),
/// {
/// return x * x;
/// });
/// \endcode
///
/// And to create a function which sums two numbers:
/// \code
/// BOOST_COMPUTE_FUNCTION(int, sum_two, (int x, int y),
/// {
/// return x + y;
/// });
/// \endcode
///
/// \see BOOST_COMPUTE_CLOSURE()
#ifdef BOOST_COMPUTE_DOXYGEN_INVOKED
#define BOOST_COMPUTE_FUNCTION(return_type, name, arguments, source)
#else
#define BOOST_COMPUTE_FUNCTION(return_type, name, arguments, ...) \
::boost::compute::function<return_type arguments> name = \
::boost::compute::detail::make_function_impl<return_type arguments>( \
#name, #arguments, #__VA_ARGS__ \
)
#endif
#endif // BOOST_COMPUTE_FUNCTION_HPP
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