How to use map in shared memory

[Man4ish]

First of all i would like to thank this forum for helping me for all my previous queries and providing help. Now i am successful in developing a search engine. Now moving one step ahead, I need to load the map into memory to make it faster. I am planing to load the index map(map <string, string>) into memory using IPC(shared memory) and using the same with another program. I am successful in storing the string in the memory segment and reading it with another program but now i am planning to use map. How can i do that?Thanks in advance.

[weaknessforcats]

It's called client/server. The client passes a query to the server. The server looks up the data and passes back the results.

Your shared memory can be used for the query submittal and the results. Note that all pointer values are unique to a process and cannot be used from anither process.

Your client is ProcessA and your server is ProcessB. They communicate using shared memory but your map must be in one process or the other.

[Man4ish]

For string i have tried but for map i could not find any example for storing index values in map in process1 and reading the map with process2.Any example doing the same will really help me. Thanks in advance.

[weaknessforcats]

You cannot read a map in Process1 that is in Process2 shared memory or not.

Pointer values are unique to a process. There is no sharing of addresses between processes.

You put the map in Process 2.

Then you write a function you call in Process 1 that passes a key to shared memory.

Process 2 reads the key from shared memory and then reads the map it has in Process 2 using the key.

Process 2 then calls a function that puts the retreived value in shared memory.

Process 1 reads the value from shared memory.

You will need to set up interprocess communications to synchronize these calls. Read up on mutexes.