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#pragma once
#include <string_view>
#include <unordered_map>
namespace DB
{
class FunctionFactory;
using FunctionRegisterFunctionPtr = void (*)(::DB::FunctionFactory &);
struct FunctionRegisterMap : public std::unordered_map<std::string_view, FunctionRegisterFunctionPtr>
{
static FunctionRegisterMap & instance();
};
struct FunctionRegister
{
FunctionRegister(std::string_view name, FunctionRegisterFunctionPtr func_ptr)
{
FunctionRegisterMap::instance().emplace(std::move(name), func_ptr);
}
};
}
#define REGISTER_FUNCTION_IMPL(fn, func_name, register_name) \
void func_name(::DB::FunctionFactory & factory); \
static ::DB::FunctionRegister register_name(#fn, func_name); \
void func_name(::DB::FunctionFactory & factory)
#define REGISTER_FUNCTION(fn) REGISTER_FUNCTION_IMPL(fn, registerFunction##fn, REGISTER_FUNCTION_##fn)
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