[英]boost::interprocess::basic_string as std::string
[英]boost::interprocess::map - how to update value with basic_string as type
我有以下代码:
typedef managed_shared_memory::segment_manager segment_manager_t;
typedef allocator<void, segment_manager_t> void_allocator;
typedef allocator<char, segment_manager_t> char_allocator;
typedef basic_string<char, std::char_traits<char>, char_allocator> char_string;
typedef std::pair<const char_string, char_string> map_value_type;
typedef allocator<map_value_type, segment_manager_t> map_value_type_allocator;
typedef map< char_string, char_string, std::less<char_string>, map_value_type_allocator> complex_map_type;
........
managed_shared_memory segment(open_only,shm_name.c_str());
//An allocator convertible to any allocator<T, segment_manager_t> type
void_allocator alloc_inst (segment.get_segment_manager());
complex_map_type *myMap = segment.find_or_construct<complex_map_type>("myMap")(std::less<char_string>(), alloc_inst);
//Here I am trying to update value. Key exists in the map.
(*myMap)[char_string(key.c_str(), alloc_inst)] = char_string(val.c_str(), alloc_inst);
谁能给我最后一行的正确语法? 最后一行给我一个编译错误。
在此先感谢您的帮助。
我有答案。
char_string key(var.c_str(), alloc_inst);
complex_map_type::iterator it = myMap->find(key);
if( it != myMap->end() )
(*it).second = char_string(new_value.c_str(), alloc_inst);
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