libs/function/test/function_test.cpp
// Boost.Function library
// Copyright Douglas Gregor 2001-2003. Use, modification and
// distribution is subject to the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// For more information, see http://www.boost.org
#include <boost/test/minimal.hpp>
#include <boost/function.hpp>
#include <functional>
#include <string>
#include <utility>
using boost::function;
using std::string;
int global_int;
struct write_five_obj { void operator()() const { global_int = 5; } };
struct write_three_obj { int operator()() const { global_int = 3; return 7; }};
static void write_five() { global_int = 5; }
static void write_three() { global_int = 3; }
struct generate_five_obj { int operator()() const { return 5; } };
struct generate_three_obj { int operator()() const { return 3; } };
static int generate_five() { return 5; }
static int generate_three() { return 3; }
static string identity_str(const string& s) { return s; }
static string string_cat(const string& s1, const string& s2) { return s1+s2; }
static int sum_ints(int x, int y) { return x+y; }
struct write_const_1_nonconst_2
{
void operator()() { global_int = 2; }
void operator()() const { global_int = 1; }
};
struct add_to_obj
{
add_to_obj(int v) : value(v) {}
int operator()(int x) const { return value + x; }
int value;
};
static void
test_zero_args()
{
typedef function<void ()> func_void_type;
write_five_obj five;
write_three_obj three;
// Default construction
func_void_type v1;
BOOST_CHECK(v1.empty());
// Assignment to an empty function
v1 = five;
BOOST_CHECK(v1 != 0);
// Invocation of a function
global_int = 0;
v1();
BOOST_CHECK(global_int == 5);
// clear() method
v1.clear();
BOOST_CHECK(v1 == 0);
// Assignment to an empty function
v1 = three;
BOOST_CHECK(!v1.empty());
// Invocation and self-assignment
global_int = 0;
v1 = v1;
v1();
BOOST_CHECK(global_int == 3);
// Assignment to a non-empty function
v1 = five;
// Invocation and self-assignment
global_int = 0;
v1 = (v1);
v1();
BOOST_CHECK(global_int == 5);
// clear
v1 = 0;
BOOST_CHECK(0 == v1);
// Assignment to an empty function from a free function
v1 = BOOST_FUNCTION_TARGET_FIX(&) write_five;
BOOST_CHECK(0 != v1);
// Invocation
global_int = 0;
v1();
BOOST_CHECK(global_int == 5);
// Assignment to a non-empty function from a free function
v1 = BOOST_FUNCTION_TARGET_FIX(&) write_three;
BOOST_CHECK(!v1.empty());
// Invocation
global_int = 0;
v1();
BOOST_CHECK(global_int == 3);
// Assignment
v1 = five;
BOOST_CHECK(!v1.empty());
// Invocation
global_int = 0;
v1();
BOOST_CHECK(global_int == 5);
// Assignment to a non-empty function from a free function
v1 = &write_three;
BOOST_CHECK(!v1.empty());
// Invocation
global_int = 0;
v1();
BOOST_CHECK(global_int == 3);
// Construction from another function (that is empty)
v1.clear();
func_void_type v2(v1);
BOOST_CHECK(!v2? true : false);
// Assignment to an empty function
v2 = three;
BOOST_CHECK(!v2.empty());
// Invocation
global_int = 0;
v2();
BOOST_CHECK(global_int == 3);
// Assignment to a non-empty function
v2 = (five);
// Invocation
global_int = 0;
v2();
BOOST_CHECK(global_int == 5);
v2.clear();
BOOST_CHECK(v2.empty());
// Assignment to an empty function from a free function
v2 = (BOOST_FUNCTION_TARGET_FIX(&) write_five);
BOOST_CHECK(v2? true : false);
// Invocation
global_int = 0;
v2();
BOOST_CHECK(global_int == 5);
// Assignment to a non-empty function from a free function
v2 = BOOST_FUNCTION_TARGET_FIX(&) write_three;
BOOST_CHECK(!v2.empty());
// Invocation
global_int = 0;
v2();
BOOST_CHECK(global_int == 3);
// Swapping
v1 = five;
swap(v1, v2);
v2();
BOOST_CHECK(global_int == 5);
v1();
BOOST_CHECK(global_int == 3);
swap(v1, v2);
v1.clear();
// Assignment
v2 = five;
BOOST_CHECK(!v2.empty());
// Invocation
global_int = 0;
v2();
BOOST_CHECK(global_int == 5);
// Assignment to a non-empty function from a free function
v2 = &write_three;
BOOST_CHECK(!v2.empty());
// Invocation
global_int = 0;
v2();
BOOST_CHECK(global_int == 3);
// Assignment to a function from an empty function
v2 = v1;
BOOST_CHECK(v2.empty());
// Assignment to a function from a function with a functor
v1 = three;
v2 = v1;
BOOST_CHECK(!v1.empty());
BOOST_CHECK(!v2.empty());
// Invocation
global_int = 0;
v1();
BOOST_CHECK(global_int == 3);
global_int = 0;
v2();
BOOST_CHECK(global_int == 3);
// Assign to a function from a function with a function
v2 = BOOST_FUNCTION_TARGET_FIX(&) write_five;
v1 = v2;
BOOST_CHECK(!v1.empty());
BOOST_CHECK(!v2.empty());
global_int = 0;
v1();
BOOST_CHECK(global_int == 5);
global_int = 0;
v2();
BOOST_CHECK(global_int == 5);
// Construct a function given another function containing a function
func_void_type v3(v1);
// Invocation of a function
global_int = 0;
v3();
BOOST_CHECK(global_int == 5);
// clear() method
v3.clear();
BOOST_CHECK(!v3? true : false);
// Assignment to an empty function
v3 = three;
BOOST_CHECK(!v3.empty());
// Invocation
global_int = 0;
v3();
BOOST_CHECK(global_int == 3);
// Assignment to a non-empty function
v3 = five;
// Invocation
global_int = 0;
v3();
BOOST_CHECK(global_int == 5);
// clear()
v3.clear();
BOOST_CHECK(v3.empty());
// Assignment to an empty function from a free function
v3 = &write_five;
BOOST_CHECK(!v3.empty());
// Invocation
global_int = 0;
v3();
BOOST_CHECK(global_int == 5);
// Assignment to a non-empty function from a free function
v3 = &write_three;
BOOST_CHECK(!v3.empty());
// Invocation
global_int = 0;
v3();
BOOST_CHECK(global_int == 3);
// Assignment
v3 = five;
BOOST_CHECK(!v3.empty());
// Invocation
global_int = 0;
v3();
BOOST_CHECK(global_int == 5);
// Construction of a function from a function containing a functor
func_void_type v4(v3);
// Invocation of a function
global_int = 0;
v4();
BOOST_CHECK(global_int == 5);
// clear() method
v4.clear();
BOOST_CHECK(v4.empty());
// Assignment to an empty function
v4 = three;
BOOST_CHECK(!v4.empty());
// Invocation
global_int = 0;
v4();
BOOST_CHECK(global_int == 3);
// Assignment to a non-empty function
v4 = five;
// Invocation
global_int = 0;
v4();
BOOST_CHECK(global_int == 5);
// clear()
v4.clear();
BOOST_CHECK(v4.empty());
// Assignment to an empty function from a free function
v4 = &write_five;
BOOST_CHECK(!v4.empty());
// Invocation
global_int = 0;
v4();
BOOST_CHECK(global_int == 5);
// Assignment to a non-empty function from a free function
v4 = &write_three;
BOOST_CHECK(!v4.empty());
// Invocation
global_int = 0;
v4();
BOOST_CHECK(global_int == 3);
// Assignment
v4 = five;
BOOST_CHECK(!v4.empty());
// Invocation
global_int = 0;
v4();
BOOST_CHECK(global_int == 5);
// Construction of a function from a functor
func_void_type v5(five);
// Invocation of a function
global_int = 0;
v5();
BOOST_CHECK(global_int == 5);
// clear() method
v5.clear();
BOOST_CHECK(v5.empty());
// Assignment to an empty function
v5 = three;
BOOST_CHECK(!v5.empty());
// Invocation
global_int = 0;
v5();
BOOST_CHECK(global_int == 3);
// Assignment to a non-empty function
v5 = five;
// Invocation
global_int = 0;
v5();
BOOST_CHECK(global_int == 5);
// clear()
v5.clear();
BOOST_CHECK(v5.empty());
// Assignment to an empty function from a free function
v5 = &write_five;
BOOST_CHECK(!v5.empty());
// Invocation
global_int = 0;
v5();
BOOST_CHECK(global_int == 5);
// Assignment to a non-empty function from a free function
v5 = &write_three;
BOOST_CHECK(!v5.empty());
// Invocation
global_int = 0;
v5();
BOOST_CHECK(global_int == 3);
// Assignment
v5 = five;
BOOST_CHECK(!v5.empty());
// Invocation
global_int = 0;
v5();
BOOST_CHECK(global_int == 5);
// Construction of a function from a function
func_void_type v6(&write_five);
// Invocation of a function
global_int = 0;
v6();
BOOST_CHECK(global_int == 5);
// clear() method
v6.clear();
BOOST_CHECK(v6.empty());
// Assignment to an empty function
v6 = three;
BOOST_CHECK(!v6.empty());
// Invocation
global_int = 0;
v6();
BOOST_CHECK(global_int == 3);
// Assignment to a non-empty function
v6 = five;
// Invocation
global_int = 0;
v6();
BOOST_CHECK(global_int == 5);
// clear()
v6.clear();
BOOST_CHECK(v6.empty());
// Assignment to an empty function from a free function
v6 = &write_five;
BOOST_CHECK(!v6.empty());
// Invocation
global_int = 0;
v6();
BOOST_CHECK(global_int == 5);
// Assignment to a non-empty function from a free function
v6 = &write_three;
BOOST_CHECK(!v6.empty());
// Invocation
global_int = 0;
v6();
BOOST_CHECK(global_int == 3);
// Assignment
v6 = five;
BOOST_CHECK(!v6.empty());
// Invocation
global_int = 0;
v6();
BOOST_CHECK(global_int == 5);
// Const vs. non-const
write_const_1_nonconst_2 one_or_two;
const function<void ()> v7(one_or_two);
function<void ()> v8(one_or_two);
global_int = 0;
v7();
BOOST_CHECK(global_int == 2);
global_int = 0;
v8();
BOOST_CHECK(global_int == 2);
// Test construction from 0 and comparison to 0
func_void_type v9(0);
BOOST_CHECK(v9 == 0);
BOOST_CHECK(0 == v9);
// Test return values
typedef function<int ()> func_int_type;
generate_five_obj gen_five;
generate_three_obj gen_three;
func_int_type i0(gen_five);
BOOST_CHECK(i0() == 5);
i0 = gen_three;
BOOST_CHECK(i0() == 3);
i0 = &generate_five;
BOOST_CHECK(i0() == 5);
i0 = &generate_three;
BOOST_CHECK(i0() == 3);
BOOST_CHECK(i0? true : false);
i0.clear();
BOOST_CHECK(!i0? true : false);
// Test return values with compatible types
typedef function<long ()> func_long_type;
func_long_type i1(gen_five);
BOOST_CHECK(i1() == 5);
i1 = gen_three;
BOOST_CHECK(i1() == 3);
i1 = &generate_five;
BOOST_CHECK(i1() == 5);
i1 = &generate_three;
BOOST_CHECK(i1() == 3);
BOOST_CHECK(i1? true : false);
i1.clear();
BOOST_CHECK(!i1? true : false);
}
static void
test_one_arg()
{
std::negate<int> neg;
function<int (int)> f1(neg);
BOOST_CHECK(f1(5) == -5);
function<string (string)> id(&identity_str);
BOOST_CHECK(id("str") == "str");
function<string (const char*)> id2(&identity_str);
BOOST_CHECK(id2("foo") == "foo");
add_to_obj add_to(5);
function<int (int)> f2(add_to);
BOOST_CHECK(f2(3) == 8);
const function<int (int)> cf2(add_to);
BOOST_CHECK(cf2(3) == 8);
}
static void
test_two_args()
{
function<string (const string&, const string&)> cat(&string_cat);
BOOST_CHECK(cat("str", "ing") == "string");
function<int (short, short)> sum(&sum_ints);
BOOST_CHECK(sum(2, 3) == 5);
}
static void
test_emptiness()
{
function<float ()> f1;
BOOST_CHECK(f1.empty());
function<float ()> f2;
f2 = f1;
BOOST_CHECK(f2.empty());
function<double ()> f3;
f3 = f2;
BOOST_CHECK(f3.empty());
}
struct X {
X(int v) : value(v) {}
int twice() const { return 2*value; }
int plus(int v) { return value + v; }
int value;
};
static void
test_member_functions()
{
boost::function<int (X*)> f1(&X::twice);
X one(1);
X five(5);
BOOST_CHECK(f1(&one) == 2);
BOOST_CHECK(f1(&five) == 10);
boost::function<int (X*)> f1_2;
f1_2 = &X::twice;
BOOST_CHECK(f1_2(&one) == 2);
BOOST_CHECK(f1_2(&five) == 10);
boost::function<int (X&, int)> f2(&X::plus);
BOOST_CHECK(f2(one, 3) == 4);
BOOST_CHECK(f2(five, 4) == 9);
}
struct add_with_throw_on_copy {
int operator()(int x, int y) const { return x+y; }
add_with_throw_on_copy() {}
add_with_throw_on_copy(const add_with_throw_on_copy&)
{
throw std::runtime_error("But this CAN'T throw");
}
add_with_throw_on_copy& operator=(const add_with_throw_on_copy&)
{
throw std::runtime_error("But this CAN'T throw");
}
};
static void
test_ref()
{
add_with_throw_on_copy atc;
try {
boost::function<int (int, int)> f(boost::ref(atc));
BOOST_CHECK(f(1, 3) == 4);
}
catch(std::runtime_error e) {
BOOST_ERROR("Nonthrowing constructor threw an exception");
}
}
static void dummy() {}
static void test_empty_ref()
{
boost::function<void()> f1;
boost::function<void()> f2(boost::ref(f1));
try {
f2();
BOOST_ERROR("Exception didn't throw for reference to empty function.");
}
catch(std::runtime_error e) {}
f1 = dummy;
try {
f2();
}
catch(std::runtime_error e) {
BOOST_ERROR("Error calling referenced function.");
}
}
static void test_exception()
{
boost::function<int (int, int)> f;
try {
f(5, 4);
BOOST_CHECK(false);
}
catch(boost::bad_function_call) {
// okay
}
}
typedef boost::function< void * (void * reader) > reader_type;
typedef std::pair<int, reader_type> mapped_type;
static void test_implicit()
{
mapped_type m;
m = mapped_type();
}
static void test_call_obj(boost::function<int (int, int)> f)
{
BOOST_CHECK(!f.empty());
}
static void test_call_cref(const boost::function<int (int, int)>& f)
{
BOOST_CHECK(!f.empty());
}
static void test_call()
{
test_call_obj(std::plus<int>());
test_call_cref(std::plus<int>());
}
struct big_aggregating_structure {
int disable_small_objects_optimizations[32];
big_aggregating_structure()
{
++ global_int;
}
big_aggregating_structure(const big_aggregating_structure&)
{
++ global_int;
}
~big_aggregating_structure()
{
-- global_int;
}
void operator()()
{
++ global_int;
}
void operator()(int)
{
++ global_int;
}
};
template <class FunctionT>
static void test_move_semantics()
{
typedef FunctionT f1_type;
big_aggregating_structure obj;
f1_type f1 = obj;
global_int = 0;
f1();
BOOST_CHECK(!f1.empty());
BOOST_CHECK(global_int == 1);
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
// Testing rvalue constructors
f1_type f2(static_cast<f1_type&&>(f1));
BOOST_CHECK(f1.empty());
BOOST_CHECK(!f2.empty());
BOOST_CHECK(global_int == 1);
f2();
BOOST_CHECK(global_int == 2);
f1_type f3(static_cast<f1_type&&>(f2));
BOOST_CHECK(f1.empty());
BOOST_CHECK(f2.empty());
BOOST_CHECK(!f3.empty());
BOOST_CHECK(global_int == 2);
f3();
BOOST_CHECK(global_int == 3);
// Testing move assignment
f1_type f4;
BOOST_CHECK(f4.empty());
f4 = static_cast<f1_type&&>(f3);
BOOST_CHECK(f1.empty());
BOOST_CHECK(f2.empty());
BOOST_CHECK(f3.empty());
BOOST_CHECK(!f4.empty());
BOOST_CHECK(global_int == 3);
f4();
BOOST_CHECK(global_int == 4);
// Testing self move assignment
f4 = static_cast<f1_type&&>(f4);
BOOST_CHECK(!f4.empty());
BOOST_CHECK(global_int == 4);
// Testing, that no memory leaked when assigning to nonempty function
f4 = obj;
BOOST_CHECK(!f4.empty());
BOOST_CHECK(global_int == 4);
f1_type f5 = obj;
BOOST_CHECK(global_int == 5);
f4 = static_cast<f1_type&&>(f5);
BOOST_CHECK(global_int == 4);
#endif
}
int test_main(int, char* [])
{
test_zero_args();
test_one_arg();
test_two_args();
test_emptiness();
test_member_functions();
test_ref();
test_empty_ref();
test_exception();
test_implicit();
test_call();
test_move_semantics<function<void()> >();
test_move_semantics<boost::function0<void> >();
return 0;
}