# sc_TwoBodyTwoCenterIntV3 man page

sc::TwoBodyTwoCenterIntV3 — This implements electron repulsion integrals involving two centers in the IntV3 library.

## Synopsis

`#include <tbintv3.h>`

Inherits **sc::TwoBodyTwoCenterInt**.

### Public Member Functions

**TwoBodyTwoCenterIntV3** (**Integral** ***integral**, const **Ref**< **GaussianBasisSet** > &b1, const **Ref**< **GaussianBasisSet** > &b2, size_t storage)

int **log2_shell_bound** (int, int)

Return log base 2 of the maximum magnitude of any integral in a shell block obtained from compute_shell.

void **compute_shell** (int, int)

Given four shell indices, integrals will be computed and placed in the buffer.

size_t **storage_used** ()

void **set_integral_storage** (size_t storage)

This storage is used to cache computed integrals.

### Protected Attributes

**Ref**< **Int2eV3** > **int2ev3_**

### Additional Inherited Members

## Detailed Description

This implements electron repulsion integrals involving two centers in the IntV3 library.

## Member Function Documentation

### void sc::TwoBodyTwoCenterIntV3::compute_shell (int, int) [virtual]

Given four shell indices, integrals will be computed and placed in the buffer. The first index corresponds to electron 1 and the second index corresponds to electron 2.

Implements **sc::TwoBodyTwoCenterInt**.

### int sc::TwoBodyTwoCenterIntV3::log2_shell_bound (int, int) [virtual]

Return log base 2 of the maximum magnitude of any integral in a shell block obtained from compute_shell. An index of -1 for any argument indicates any shell.

Implements **sc::TwoBodyTwoCenterInt**.

## Author

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