# Layouts
> BLAS memory layouts.
## Usage
```javascript
var layouts = require( '@stdlib/blas/base/layouts' );
```
#### layouts()
Returns a list of BLAS memory layouts.
```javascript
var out = layouts();
// e.g., returns [ 'row-major', 'column-major' ]
```
The output array contains the following layouts:
- `row-major`: row-major (C-style) order.
- `column-major`: column-major (Fortran-style) order.
## Examples
```javascript
var contains = require( '@stdlib/array/base/assert/contains' ).factory;
var layouts = require( '@stdlib/blas/base/layouts' );
var isLayout = contains( layouts() );
var bool = isLayout( 'row-major' );
// returns true
bool = isLayout( 'column-major' );
// returns true
bool = isLayout( 'beep' );
// returns false
```
* * *
## C APIs
### Usage
```c
#include "stdlib/blas/base/layouts.h"
```
#### STDLIB_BLAS_LAYOUT
An enumeration of BLAS memory layouts with the following fields:
- **STDLIB_BLAS_ROW_MAJOR**: row-major (C-style) order.
- **STDLIB_BLAS_COLUMN_MAJOR**: column-major (Fortran-style) order.
```c
#include "stdlib/blas/base/layouts.h"
const enum STDLIB_BLAS_LAYOUT layout = STDLIB_BLAS_ROW_MAJOR;
```
### Notes
- Enumeration constants should be considered opaque values, and one should **not** rely on specific integer values.