# sc_TwoBodyIntCints - Man Page

This implements electron repulsion integrals in the IntCints library.

## Synopsis

`#include <tbintcints.h>`

Inherits **sc::TwoBodyInt**.

### Public Member Functions

**TwoBodyIntCints** (**Integral** ***integral**, const **Ref**< **GaussianBasisSet** > &b1, const **Ref**< **GaussianBasisSet** > &b2, const **Ref**< **GaussianBasisSet** > &b3, const **Ref**< **GaussianBasisSet** > &b4, size_t storage, tbinteval int2etype)

int **log2_shell_bound** (int, int, 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, int, int)

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

size_t **used_storage** () const

void **set_integral_storage** (size_t storage)

This storage is used to cache computed integrals.

const double * **buffer** (**tbint_type** te_type) const

The computed shell integrals will be put in the buffer returned by this member.

### Protected Attributes

**Ref**< **Int2eCints** > **int2ecints_**

### Additional Inherited Members

## Detailed Description

This implements electron repulsion integrals in the IntCints library.

## Member Function Documentation

### const double* sc::TwoBodyIntCints::buffer (tbint_type type) const [inline], [virtual]

The computed shell integrals will be put in the buffer returned by this member. Some **TwoBodyInt** specializations have more than one buffer: The type arguments selects which buffer is returned. If the requested type is not supported, then 0 is returned.

Reimplemented from **sc::TwoBodyInt**.

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

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

Implements **sc::TwoBodyInt**.

### int sc::TwoBodyIntCints::log2_shell_bound (int, int, 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::TwoBodyInt**.

## Author

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