# 18.2.357. MPI_T_enum_get_info

MPI_T_enum_get_info — Query information about an enumerator

## 18.2.357.1. SYNTAX

### 18.2.357.1.1. C Syntax

    #include <mpi.h>

    int MPI_T_enum_get_info(MPI_T_enum enumtype, int *num, char *name, int *name_len)

## 18.2.357.2. INPUT PARAMETERS

- `enumtype`: Enumerator to be queried.

## 18.2.357.3. INPUT/OUTPUT PARAMETERS

- `name_len`: Length of the string and/or buffer for name.

## 18.2.357.4. OUTPUT PARAMETERS

- `num`: number of discrete values represented by this enumeration.

- `name`: Buffer to return the string containing the name of the category.

## 18.2.357.5. DESCRIPTION

MPI_T_enum_get_info can be used to query information about an enumerator. The function returns the number of discrete values represented by this enumerator in the num parameter.

## 18.2.357.6. NOTES

This MPI tool interface function returns the name of the enumeration as a string. This function takes two argument for the string: name which specifies a buffer where the name of the should be stored, and name_len which must initially specify the size of the buffer pointed to by name. This function will copy at most name_len - 1 characters of the name and sets name_len to the number of characters returned + 1. If name_len is NULL or the value specified in name_len is 0 the name buffer is ignored and the name of the enumeration is not returned.

## 18.2.357.7. ERRORS

MPI_T_enum_get_info will fail if:

- `MPI_T_ERR_NOT_INITIALIZED`: The MPI Tools interface not initialized

- `MPI_T_ERR_INVALID_INDEX`: The enumeration is invalid or has been deleted