feat: add III_D macro in math/base/napi/ternary

lib/node_modules/@stdlib/math/base/napi/ternary/README.md

@@ -449,6 +449,69 @@ The function accepts the following arguments:
 void stdlib_math_base_napi_iid_d( napi_env env, napi_callback_info info, double (*fcn)( int32_t, int32_t, double ) );
 ```
 
+#### STDLIB_MATH_BASE_NAPI_MODULE_III_D( fcn )
+
+Macro for registering a Node-API module exporting an interface for invoking a ternary function accepting three signed 32-bit integers and returning a double-precision floating-point number.
+
+```c
+#include <stdint.h>
+
+static double fcn( const int32_t x, const int32_t y, const int32_t z ) {
+    // ...
+}
+
+// ...
+
+// Register a Node-API module:
+STDLIB_MATH_BASE_NAPI_MODULE_III_D( fcn );
+```
+
+The macro expects the following arguments:
+
+-   **fcn**: `double (*fcn)( int32_t, int32_t, int32_t )` ternary function.
+
+When used, this macro should be used **instead of** `NAPI_MODULE`. The macro includes `NAPI_MODULE`, thus ensuring Node-API module registration.
+
+#### stdlib_math_base_napi_iii_d( env, info, fcn )
+
+Invokes a ternary function accepting three signed 32-bit integers and returning a double-precision floating-point number.
+
+```c
+#include <node_api.h>
+#include <stdint.h>
+
+// ...
+
+static double fcn( const int32_t x, const int32_t y, const int32_t z ) {
+    // ...
+}
+
+// ...
+
+/**
+* Receives JavaScript callback invocation data.
+*
+* @param env    environment under which the function is invoked
+* @param info   callback data
+* @return       Node-API value
+*/
+napi_value addon( napi_env env, napi_callback_info info ) {
+    return stdlib_math_base_napi_iii_d( env, info, fcn );
+}
+
+// ...
+```
+
+The function accepts the following arguments:
+
+-   **env**: `[in] napi_env` environment under which the function is invoked.
+-   **info**: `[in] napi_callback_info` callback data.
+-   **fcn**: `[in] double (*fcn)( int32_t, int32_t, int32_t )` ternary function.
+
+```c
+void stdlib_math_base_napi_iii_d( napi_env env, napi_callback_info info, double (*fcn)( int32_t, int32_t, int32_t ) );
+```
+
 #### STDLIB_MATH_BASE_NAPI_MODULE_ZZZ_Z( fcn )
 
 Macro for registering a Node-API module exporting an interface for invoking a ternary function accepting and returning double-precision complex floating-point numbers.

lib/node_modules/@stdlib/math/base/napi/ternary/include/stdlib/math/base/napi/ternary.h

@@ -25,6 +25,7 @@
 #include "stdlib/math/base/napi/ternary/dii_d.h"
 #include "stdlib/math/base/napi/ternary/fff_f.h"
 #include "stdlib/math/base/napi/ternary/iid_d.h"
+#include "stdlib/math/base/napi/ternary/iii_d.h"
 #include "stdlib/math/base/napi/ternary/zzz_z.h"
 
 #endif // !STDLIB_MATH_BASE_NAPI_TERNARY_H

lib/node_modules/@stdlib/math/base/napi/ternary/include/stdlib/math/base/napi/ternary/iii_d.h

@@ -0,0 +1,84 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#ifndef STDLIB_MATH_BASE_NAPI_TERNARY_III_D_H
+#define STDLIB_MATH_BASE_NAPI_TERNARY_III_D_H
+
+#include <node_api.h>
+#include <assert.h>
+#include <stdint.h>
+
+/**
+* Macro for registering a Node-API module exporting an interface invoking a ternary function accepting three signed 32-bit integers and returning a double-precision floating-point number.
+*
+* @param fcn   ternary function
+*
+* @example
+* #include <stdint.h>
+*
+* static double fcn( const int_32 x, const int_32 y, const int_32 z ) {
+*     // ...
+* }
+*
+* // ...
+*
+* // Register a Node-API module:
+* STDLIB_MATH_BASE_NAPI_MODULE_III_D( fcn );
+*/
+#define STDLIB_MATH_BASE_NAPI_MODULE_III_D( fcn )                              \
+	static napi_value stdlib_math_base_napi_iii_d_wrapper(                     \
+		napi_env env,                                                          \
+		napi_callback_info info                                                \
+	) {                                                                        \
+		return stdlib_math_base_napi_iii_d( env, info, fcn );                  \
+	};                                                                         \
+	static napi_value stdlib_math_base_napi_iii_d_init(                        \
+		napi_env env,                                                          \
+		napi_value exports                                                     \
+	) {                                                                        \
+		napi_value fcn;                                                        \
+		napi_status status = napi_create_function(                             \
+			env,                                                               \
+			"exports",                                                         \
+			NAPI_AUTO_LENGTH,                                                  \
+			stdlib_math_base_napi_iii_d_wrapper,                               \
+			NULL,                                                              \
+			&fcn                                                               \
+		);                                                                     \
+		assert( status == napi_ok );                                           \
+		return fcn;                                                            \
+	};                                                                         \
+	NAPI_MODULE( NODE_GYP_MODULE_NAME, stdlib_math_base_napi_iii_d_init )
+
+/*
+* If C++, prevent name mangling so that the compiler emits a ternary file having undecorated names, thus mirroring the behavior of a C compiler.
+*/
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+* Invokes a ternary function accepting three signed 32-bit integers and returning a double-precision floating-point number.
+*/
+napi_value stdlib_math_base_napi_iii_d( napi_env env, napi_callback_info info, double (*fcn)( int32_t, int32_t, int32_t ) );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // !STDLIB_MATH_BASE_NAPI_TERNARY_III_D_H

lib/node_modules/@stdlib/math/base/napi/ternary/src/iii_d.c

@@ -0,0 +1,98 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#include "stdlib/math/base/napi/ternary/iii_d.h"
+#include <node_api.h>
+#include <stdint.h>
+#include <assert.h>
+
+/**
+* Invokes a ternary function accepting three signed 32-bit integers and returning a double-precision floating-point number.
+*
+* ## Notes
+*
+* -   This function expects that the callback `info` argument provides access to the following JavaScript arguments:
+*
+*     -   `x`: input value.
+*     -   `y`: input value.
+*     -   `z`: input value.
+*
+* @param env    environment under which the function is invoked
+* @param info   callback data
+* @param fcn    ternary function
+* @return       function return value as a Node-API double-precision floating-point number
+*/
+napi_value stdlib_math_base_napi_iii_d( napi_env env, napi_callback_info info, double (*fcn)( int32_t, int32_t, int32_t ) ) {
+	napi_status status;
+
+	size_t argc = 3;
+	napi_value argv[ 3 ];
+	status = napi_get_cb_info( env, info, &argc, argv, NULL, NULL );
+	assert( status == napi_ok );
+
+	if ( argc < 3 ) {
+		status = napi_throw_error( env, NULL, "invalid invocation. Must provide three numbers." );
+		assert( status == napi_ok );
+		return NULL;
+	}
+
+	napi_valuetype vtype0;
+	status = napi_typeof( env, argv[ 0 ], &vtype0 );
+	assert( status == napi_ok );
+	if ( vtype0 != napi_number ) {
+		status = napi_throw_type_error( env, NULL, "invalid argument. First argument must be a number." );
+		assert( status == napi_ok );
+		return NULL;
+	}
+
+	napi_valuetype vtype1;
+	status = napi_typeof( env, argv[ 1 ], &vtype1 );
+	assert( status == napi_ok );
+	if ( vtype1 != napi_number ) {
+		status = napi_throw_type_error( env, NULL, "invalid argument. Second argument must be a number." );
+		assert( status == napi_ok );
+		return NULL;
+	}
+
+	napi_valuetype vtype2;
+	status = napi_typeof( env, argv[ 2 ], &vtype2 );
+	assert( status == napi_ok );
+	if ( vtype2 != napi_number ) {
+		status = napi_throw_type_error( env, NULL, "invalid argument. Third argument must be a number." );
+		assert( status == napi_ok );
+		return NULL;
+	}
+
+	int32_t x;
+	status = napi_get_value_int32( env, argv[ 0 ], &x );
+	assert( status == napi_ok );
+
+	int32_t y;
+	status = napi_get_value_int32( env, argv[ 1 ], &y );
+	assert( status == napi_ok );
+
+	int32_t z;
+	status = napi_get_value_int32( env, argv[ 2 ], &z );
+	assert( status == napi_ok );
+
+	napi_value v;
+	status = napi_create_double( env, fcn( x, y, z ), &v );
+	assert( status == napi_ok );
+
+	return v;
+}