MPI_T_ENUM_GET_ITEM(3)

💅 MPI_T_ENUM_GET_ITEM(3) — Open MPI, bestie edition

Ok so first things first: this is a page from the Open MPI manual, and the function we're stanning today is MPI_T_enum_get_item. Bestie, it's literally the "tell me everything about one item in this enum" function. Let's get into it ✨

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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 want to be queried. Like, which enum are we snooping on 👀
• index — the number of the value to be queried in this enumeration. It's giving "row number in the enum menu" ngl 📋

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🦋 INPUT/OUTPUT PARAMETERS 🦋

• name_len — length of the string and/or buffer for name. Yeah she's both an input and an output, she contains multitudes 💅

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⭐ OUTPUT PARAMETERS ⭐

• value — variable value. The actual number, slay 🔥
• name — buffer to return the string containing the name of the category 🏷️

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💜 DESCRIPTION 💜

So MPI_T_enum_get_item can be used to query information about an item in an enumerator. This function returns the enumeration value in the value parameter. That's it, that's the whole vibe — you point at an item, it hands you the goods ✨

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🌈 NOTES 🌈

This MPI tool interface function returns the name of the item as a string. And listen, because this is the part where people get got 😭 — 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.

Here's the math, no cap: if the length passed is n then this function will copy at most n - 1 characters of the string into the buffer and sets the length to the number of characters copied - 1.

🚨 And 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. So don't come crying to me when name is empty, bestie, you literally asked for zero bytes 🙈

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 girl, you gotta boot it up first 🥲
• MPI_T_ERR_INVALID_INDEX — the enumeration is invalid or has been deleted. Rip, she's gone, she's deleted, she's not coming back to the group chat 💀

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👑 COPYRIGHT 👑

2003-2026, The Open MPI Community

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Ok that's the whole page and I kept every single deet for you, bestie, you're welcome 🫶 The Open MPI Community holds the copyright from 2003-2026, and this particular page was dated Sep 11, 2026 — iconic date, iconic function, MPI_T_ENUM_GET_ITEM(3) out 💅✨