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• Accessing Internal Server from Outside through SSH

  - by myahya

  The issue is as follows: I am using Ubuntu Linux. I am working from home, and I need to access a PostgreSQL database severer within my company's network. Call the DB server X. For security reasons, only one machine can be accessed from the outside using ssh, call it Y. So the scenario is: Home <--SSH-- Y <----- X(DB) I think something like SSH forwarding (configured in .ssh/config) could help with this, but I am not sure how to do this, any ideas?

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• Tuples of unknown size/parameter types

  - by myahya

  I need to create a map, from integers to sets of tuples, the tuples in a single set have the same size. The problem is that the size of a tuple and its parameter types can be determined at runtime, not compile time. I am imagining something like: std::map<int, std::set<boost::tuple> > but not exctly sure how to exactly do this, bossibly using pointers. The purpose of this is to create temporary relations (tables), each with a unique identifier (key), maybe you have another approach.

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• Caching in mmap

  - by myahya

  I am using mmap call to read from a very big file using simple pointer arithmetic in C++. The problem is that when I read small chunks of data (in the order of KBs) multiple times, each read take the same amount of time as the previous one. How can I know if the disk is being accessed to fulfill my request or whether the request is being fulfilled from main memory (page cache) in calls after the first one.

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• Polymorphic functions with parameters from a class hierarchy

  - by myahya

  Let's say I have the following class hierarchy in C++: class Base; class Derived1 : public Base; class Derived2 : public Base; class ParamType; class DerivedParamType1 : public ParamType; class DerivedParamType2 : public ParamType; And I want a polymorphic function, func(ParamType), defined in Base to take a parameter of type DerivedParamType1 for Derived1 and a parameter of type DerivedParamType2 for Derived2. How would this be done without pointers, if possible?

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• Checking the sizeof an integer type in the preprocessor

  - by myahya

  How can I check the size of an unsigned in the preprocessor under g++? sizeof is out of the question since it is not defined when during preprocessing.

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• Custom (pool) allocator with boost shared_ptr

  - by myahya

  I want objects managed by a shared_ptr to be allocated from a pool, say Boost's Pool interface, how can this be achieved?

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• Compiling in g++ for gprof

  - by myahya

  I do not understand the documentation for gprof regarding how to compile your program for profiling with gprof. In g++, is it required to compile with the -g option (debugging information) in a addition to the -pg option or not. In each case I get different results, and I would like to see where the bottlenecks in my application are in release mode, not in debug mode, where many optimizations are left out by the compiler (e.g. inlining)

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• Main Memory Database with C++ Interface

  - by myahya

  I am looking for a main memory database with a C++ interface. I am looking for a database with a programmatic query interface and preferably one that works with native C++ types. SQLLite, for example, takes queries as string and needs to perform parsing ... which is time consuming. The operations I am looking for are: Creation of tables of arbitrary dimensions (number of attributes) capable of storing integer types. Support for insertion, deletion, selection, projection and (not a priority) joins.

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• C++ hash table implementation with collision handling

  - by myahya

  What is a good C++ library for hash tables / hash maps similar to what java offers. I have worked with Google Sparsehash, but it has no support for collisions.

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• C++ STL-conforming Allocators

  - by myahya

  What allocators are available out there for use with STL when dealing with small objects. I have already tried playing with pool allocators from Boost, but got no performance improvement (actually, in some cases there was considerable degradation).

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