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/* Self tests for function_view for GDB, the GNU debugger.
Copyright (C) 2017-2022 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbsupport/selftest.h"
#include "gdbsupport/function-view.h"
namespace selftests {
namespace function_view {
static int
plus_one_fn_int (int val)
{
return ++val;
}
static short
plus_one_fn_short (short val)
{
return ++val;
}
static int
call_callback_int (int val, gdb::function_view <int (int)> callback)
{
return callback (val);
}
static void
call_callback_void (int val, gdb::function_view <void (int)> callback)
{
callback (val);
}
struct plus_one_int_func_obj
{
int operator () (int val)
{
++call_count;
return ++val;
}
/* Number of times called. */
int call_count = 0;
};
static void
run_tests ()
{
/* A simple lambda. */
auto plus_one_lambda = [] (int val) { return ++val; };
/* A function_view that references the lambda. */
gdb::function_view<int (int)> plus_one_func_view (plus_one_lambda);
/* Check calling the lambda directly. */
SELF_CHECK (plus_one_lambda (0) == 1);
SELF_CHECK (plus_one_lambda (1) == 2);
/* Check calling lambda via the view. */
SELF_CHECK (plus_one_func_view (2) == 3);
SELF_CHECK (plus_one_func_view (3) == 4);
/* Check calling a function that takes a function_view as argument,
by value. Pass a lambda, making sure a function_view is properly
constructed implicitly. */
SELF_CHECK (call_callback_int (1, [] (int val)
{
return val + 2;
}) == 3);
/* Same, passing a named/lvalue lambda. */
SELF_CHECK (call_callback_int (1, plus_one_lambda) == 2);
/* Same, passing a named/lvalue function_view (should copy). */
SELF_CHECK (call_callback_int (1, plus_one_func_view) == 2);
/* Check constructing a function view over a function-object
callable, and calling it. */
plus_one_int_func_obj func_obj;
SELF_CHECK (func_obj (0) == 1);
SELF_CHECK (call_callback_int (1, func_obj) == 2);
/* Check that the callable was referenced, not copied. */
SELF_CHECK (func_obj.call_count == 2);
/* Check constructing a function_view over a free-function callable,
and calling it. */
SELF_CHECK (call_callback_int (1, plus_one_fn_int) == 2);
/* Check calling a function with a
compatible-but-not-exactly-the-same prototype. */
SELF_CHECK (call_callback_int (1, [] (short val) -> short
{
return val + 2;
}) == 3);
/* Same, but passing a function pointer. */
SELF_CHECK (call_callback_int (1, plus_one_fn_short) == 2);
/* Like std::function, a function_view that expects a void return
can reference callables with non-void return type. The result is
simply discarded. Check a lambda, function object and a function
pointer. */
call_callback_void (1, [] (int val) -> int
{
return val + 2;
});
call_callback_void (1, func_obj);
call_callback_void (1, plus_one_fn_int);
/* Check that the main ctor doesn't hijack the copy ctor. */
auto plus_one_func_view2 (plus_one_func_view);
auto plus_one_func_view3 (plus_one_func_view2);
static_assert (std::is_same<decltype (plus_one_func_view),
decltype (plus_one_func_view2)>::value, "");
static_assert (std::is_same<decltype (plus_one_func_view),
decltype (plus_one_func_view3)>::value, "");
SELF_CHECK (plus_one_func_view3 (1) == 2);
/* Likewise, but propagate a NULL callable. If this calls the main
function_view ctor instead of the copy ctor by mistake, then
null_func_2 ends up non-NULL (because it'd instead reference
null_func_1 as just another callable). */
constexpr gdb::function_view<int (int)> null_func_view_1 = nullptr;
constexpr auto null_func_view_2 (null_func_view_1);
/* While at it, check whether the function_view is bound using
various forms, op==, op!= and op bool. */
/* op== */
static_assert (null_func_view_2 == nullptr, "");
static_assert (nullptr == null_func_view_2, "");
static_assert (null_func_view_2 == NULL, "");
static_assert (NULL == null_func_view_2, "");
/* op!= */
static_assert (!(null_func_view_2 != nullptr), "");
static_assert (!(nullptr != null_func_view_2), "");
static_assert (!(null_func_view_2 != NULL), "");
static_assert (!(NULL != null_func_view_2), "");
/* op bool */
static_assert (!null_func_view_2, "");
/* Check the nullptr_t ctor. */
constexpr gdb::function_view<int (int)> check_ctor_nullptr (nullptr);
static_assert (!check_ctor_nullptr, "");
/* Check the nullptr_t op= */
gdb::function_view<int (int)> check_op_eq_null (plus_one_fn_int);
SELF_CHECK (check_op_eq_null);
check_op_eq_null = nullptr;
SELF_CHECK (!check_op_eq_null);
}
} /* namespace function_view */
} /* namespace selftests */
void _initialize_function_view_selftests ();
void
_initialize_function_view_selftests ()
{
selftests::register_test ("function_view",
selftests::function_view::run_tests);
}
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