xref: /freebsd/contrib/lutok/examples/hello.cpp (revision c697fb7f7cc9bedc5beee44d35b771c4e87b335a)

// Copyright 2012 Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
//   notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
//   notice, this list of conditions and the following disclaimer in the
//   documentation and/or other materials provided with the distribution.
// * Neither the name of Google Inc. nor the names of its contributors
//   may be used to endorse or promote products derived from this software
//   without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

/// \file examples/hello.cpp
/// Minimal example using Lua code to print a traditional hello-world message.

#include <cstdlib>

#include <lutok/state.ipp>


/// Program's entry point.
///
/// \return A system exit code.
int
main(void)
{
    // Initializes a new Lua state.  Every Lua state is independent from each
    // other.
    lutok::state state;

    // Loads the standard library into the Lua state.  Among many other
    // functions, this gives us access to print(), which is used below.
    state.open_base();

    // Pushes the print() function into the Lua stack, then its only argument,
    // and then proceeds to execute it within the Lua state.
    state.get_global("print");
    state.push_string("Hello, world!");
    state.pcall(1, 0, 0);

    return EXIT_SUCCESS;
}