@stdlib/assert/napi/status-ok/README.md

Standard assertion utilities.

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# ok status

> C utilities for asserting that a Node-API call returns an "ok" status.

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## Usage

```javascript
var headerDir = require( '@stdlib/assert/napi/status-ok' );
```

#### headerDir

Absolute file path for the directory containing header files for C APIs.

```javascript
var dir = headerDir;
// returns <string>
```

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## Examples

```javascript
var headerDir = require( '@stdlib/assert/napi/status-ok' );

console.log( headerDir );
// => <string>
```

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* * *

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## C APIs

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### Usage

```c
#include "stdlib/assert/napi/status_ok.h"
```

#### STDLIB_ASSERT_NAPI_STATUS_OK_RET_VOID( env, call, message )

Macro for asserting that a Node-API API call returns an "ok" status.

```c
#include <node_api.h>

static void foo( const napi_env env, const napi_value value, double *out ) {
    // ...

    STDLIB_ASSERT_NAPI_STATUS_OK_RET_VOID( env, napi_get_value_double( env, value, out ), "" )

    // ...

    return;
}
```

The macro expects the following arguments:

-   **env**: environment under which the function is invoked.
-   **call**: expression which returns a Node-API status.
-   **message**: error message.

If a status is not "ok", an exception is raised and `void` returned.

#### STDLIB_ASSERT_NAPI_STATUS_OK_RET_NULL( env, call, message )

Macro for asserting that a Node-API API call returns an "ok" status.

```c
#include <node_api.h>

static napi_value foo( const napi_env env, const napi_value value, double *out ) {
    // ...

    STDLIB_ASSERT_NAPI_STATUS_OK_RET_NULL( env, napi_get_value_double( env, value, out ), "" )

    // ...

    return NULL;
}
```

The macro expects the following arguments:

-   **env**: environment under which the function is invoked.
-   **call**: expression which returns a Node-API status.
-   **message**: error message.

If a status is not "ok", an exception is raised and `NULL` returned.

#### STDLIB_ASSERT_NAPI_STATUS_OK_RET_VALUE( env, call, message, value )

Macro for asserting that a Node-API API call returns an "ok" status.

```c
#include <node_api.h>

static double foo( const napi_env env, const napi_value value ) {
    // ...

    double *out;
    STDLIB_ASSERT_NAPI_STATUS_OK_RET_VALUE( env, napi_get_value_double( env, value, out ), "", 0.0/0.0 )

    // ...

    return out;
}
```

The macro expects the following arguments:

-   **env**: environment under which the function is invoked.
-   **call**: expression which returns a Node-API status.
-   **message**: error message.
-   **value**: return value.

If a status is not "ok", an exception is raised and the value specified by `value` returned.

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