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Asked: 2026-05-23T07:04:46+00:00

I am looking for a template for hash map that i can rely on,

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I am looking for a template for hash map that i can rely on, and use whenever i need hash table. I was trying to use hash_map but found out that it is deprecated now.Tried using unordered_map, but i get the following error-

error: #error This file requires compiler and library support for the upcoming ISO C++ s        tandard, C++0x. This support is currently experimental, and must be enabled with the -s    td=c++0x or -std=gnu++0x compiler options.

Now, i am completely confused. I have been using hashmap in java, and it was pleasantly straight forward. It is not so in c++.
Guide me on what to use and how to use a hash table in c++.

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  1. Editorial Team

    hash_map (or rather, unordered_map, as it was called to avoid name collisions) is in the latest version of C++ (c++0x, or c++11) but many compilers, including yours, supported it before that. Your compiler is just being nice and stopping you from writing potentially non-portable code without your explicit consent.

    As the others say, adding -std=c++0x to your compiler options will allow you to use hash_map,

    Do be aware that compiling that code somewhere else will require a rather modern c++ compiler.
    (That might not be an issue for you.. if you’re just learning by yourself or not sharing the code outside your office, you should be fine…)

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