MPI_T_ENUM_GET_ITEM(3)

💖 MPI_T_ENUM_GET_ITEM 💖

okay so bestie, this one lives in the Open MPI manual, section 3, and it's all about peeking at the little individual items inside an enumerator. no cap, it's giving "let me read the label on this enum" energy 👑

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✨ NAME ✨

MPI_T_enum_get_item — query information about an enumerator 🔍

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🌸 SYNTAX 🌸

C Syntax

#include <mpi.h>

int MPI_T_enum_get_item(MPI_T_enum enumtype, int index, int *value, char *name,
                        int *name_len)

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💅 INPUT PARAMETERS 💅

• enumtype — the enumeration you wanna interrogate. the one getting the vibe check 🫶
• index — which number's value you're looking up inside this enumeration. like, which slot in the lineup 👀

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🦋 INPUT/OUTPUT PARAMETERS 🦋

• name_len — the length of the string and/or the buffer for name. yeah she's both coming and going, she contains multitudes ✨

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🎀 OUTPUT PARAMETERS 🎀

• value — the variable's value. here's the tea 🍓
• name — the buffer where the string containing the name of the category gets returned 🏷️

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🌈 DESCRIPTION 🌈

So MPI_T_enum_get_item is your girl for querying info about an item in an enumerator. This function hands you back the enumeration value in the value parameter. that's it, that's the whole job, and she does it flawlessly 💅

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⭐ NOTES ⭐

This MPI tool interface function returns the name of the item as a string. And because strings are dramatic, this function takes two arguments for the string: a buffer to store the string, and a length which must initially specify the size of the buffer. 🫠

okay so here's the math part, pay attention bestie:

• if the length passed is n, then this function will copy at most n - 1 characters of the string into the buffer
• and it sets the length to the number of characters copied - 1

If the length argument is NULL or the value specified in the length is 0, the string buffer is ignored and the string is not returned. no string for you, boo 🙈

For more information see MPI-3 section 14.3.3. 📚

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💀 ERRORS 💀

MPI_T_enum_get_item will fail if:

• MPI_T_ERR_NOT_INITIALIZED — the MPI Tools interface not initialized 😭 like hello, wake up first
• MPI_T_ERR_INVALID_INDEX — the enumeration is invalid or has been deleted 💀 she's gone, girl, she's not coming back

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fr fr, don't be passing a dead enumeration and expecting results. initialize your tools interface first, that's the whole vibe check. 🧚

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👑 Copyright 👑

2003-2026, The Open MPI Community 💖

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and that's the whole page, bestie — main character energy from top to bottom. this gem was served up by the Open MPI crew, page dated Sep 10, 2026, and yeah, the Open MPI Community has been holding it down since 2003. slay, periodt. ✨🎀🦋