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sol2/test_functions.cpp

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#define SOL_CHECK_ARGUMENTS
#include <catch.hpp>
#include <sol.hpp>
#include <iostream>
#include "test_stack_guard.hpp"
std::function<int()> makefn() {
auto fx = []() -> int {
return 0x1456789;
};
return fx;
}
void takefn(std::function<int()> purr) {
if (purr() != 0x1456789)
throw 0;
}
struct A {
int a = 0xA; int bark() { return 1; }
};
std::tuple<int, int> bark(int num_value, A* a) {
return std::tuple<int, int>(num_value * 2, a->bark());
}
void test_free_func(std::function<void()> f) {
f();
}
void test_free_func2(std::function<int(int)> f, int arg1) {
int val = f(arg1);
if(val != arg1)
throw sol::error("failed function call!");
}
int overloaded(int x) {
std::cout << x << std::endl;
return 3;
}
int overloaded(int x, int y) {
std::cout << x << " " << y << std::endl;
return 7;
}
int overloaded(int x, int y, int z) {
std::cout << x << " " << y << " " << z << std::endl;
return 11;
}
int non_overloaded(int x, int y, int z) {
std::cout << x << " " << y << " " << z << std::endl;
return 13;
}
namespace sep {
int plop_xyz(int x, int y, std::string z) {
std::cout << x << " " << y << " " << z << std::endl;
return 11;
}
}
TEST_CASE("functions/overload-resolution", "Check if overloaded function resolution templates compile/work") {
sol::state lua;
lua.open_libraries(sol::lib::base);
lua.set_function("non_overloaded", non_overloaded);
REQUIRE_NOTHROW(lua.script("x = non_overloaded(1, 2, 3)\nprint(x)"));
/*
// Cannot reasonably support: clang++ refuses to try enough
// deductions to make this work
lua.set_function<int>("overloaded", overloaded);
REQUIRE_NOTHROW(lua.script("print(overloaded(1))"));
lua.set_function<int, int>("overloaded", overloaded);
REQUIRE_NOTHROW(lua.script("print(overloaded(1, 2))"));
lua.set_function<int, int, int>("overloaded", overloaded);
REQUIRE_NOTHROW(lua.script("print(overloaded(1, 2, 3))"));
*/
lua.set_function("overloaded", sol::resolve<int(int)>(overloaded));
REQUIRE_NOTHROW(lua.script("print(overloaded(1))"));
lua.set_function("overloaded", sol::resolve<int(int, int)>(overloaded));
REQUIRE_NOTHROW(lua.script("print(overloaded(1, 2))"));
lua.set_function("overloaded", sol::resolve<int(int, int, int)>(overloaded));
REQUIRE_NOTHROW(lua.script("print(overloaded(1, 2, 3))"));
}
TEST_CASE("functions/return-order-and-multi-get", "Check if return order is in the same reading order specified in Lua") {
const static std::tuple<int, int, int> triple = std::make_tuple(10, 11, 12);
const static std::tuple<int, float> paired = std::make_tuple(10, 10.f);
sol::state lua;
lua.set_function("f", [] {
return std::make_tuple(10, 11, 12);
} );
int a = 0;
lua.set_function( "h", []() {
return std::make_tuple( 10, 10.0f );
} );
lua.script("function g() return 10, 11, 12 end\nx,y,z = g()");
auto tcpp = lua.get<sol::function>("f").call<int, int, int>();
auto tlua = lua.get<sol::function>( "g" ).call<int, int, int>();
auto tcpp2 = lua.get<sol::function>( "h" ).call<int, float>();
auto tluaget = lua.get<int, int, int>( "x", "y", "z" );
REQUIRE(tcpp == triple);
REQUIRE(tlua == triple);
REQUIRE(tluaget == triple);
REQUIRE(tcpp2 == paired);
}
TEST_CASE("functions/deducing-return-order-and-multi-get", "Check if return order is in the same reading order specified in Lua, with regular deducing calls") {
const static std::tuple<int, int, int> triple = std::make_tuple(10, 11, 12);
sol::state lua;
lua.set_function( "f_string", []() { return "this is a string!"; } );
sol::function f_string = lua[ "f_string" ];
// Make sure there are no overload collisions / compiler errors for automatic string conversions
std::string f_string_result = f_string();
REQUIRE(f_string_result == "this is a string!");
f_string_result = f_string();
REQUIRE(f_string_result == "this is a string!");
lua.set_function("f", [] {
return std::make_tuple(10, 11, 12);
});
lua.script("function g() return 10, 11, 12 end\nx,y,z = g()");
std::tuple<int, int, int> tcpp = lua.get<sol::function>("f")();
std::tuple<int, int, int> tlua = lua.get<sol::function>("g")();
std::tuple<int, int, int> tluaget = lua.get<int, int, int>("x", "y", "z");
std::cout << "cpp: " << std::get<0>(tcpp) << ',' << std::get<1>(tcpp) << ',' << std::get<2>(tcpp) << std::endl;
std::cout << "lua: " << std::get<0>(tlua) << ',' << std::get<1>(tlua) << ',' << std::get<2>(tlua) << std::endl;
std::cout << "lua xyz: " << lua.get<int>("x") << ',' << lua.get<int>("y") << ',' << lua.get<int>("z") << std::endl;
REQUIRE(tcpp == triple);
REQUIRE(tlua == triple);
REQUIRE(tluaget == triple);
}
TEST_CASE("functions/optional-values", "check if optionals can be passed in to be nil or otherwise") {
struct thing {
int v;
};
sol::state lua;
lua.script(R"( function f (a)
return a
end )");
sol::function lua_bark = lua["f"];
sol::optional<int> testv = lua_bark(sol::optional<int>(29));
sol::optional<int> testn = lua_bark(sol::nullopt);
REQUIRE((bool)testv);
REQUIRE_FALSE((bool)testn);
REQUIRE(testv.value() == 29);
sol::optional<thing> v = lua_bark(sol::optional<thing>(thing{ 29 }));
REQUIRE_NOTHROW(sol::nil_t n = lua_bark(sol::nullopt));
REQUIRE(v->v == 29);
}
TEST_CASE("functions/pair-and-tuple-and-proxy-tests", "Check if sol::reference and sol::proxy can be passed to functions as arguments") {
sol::state lua;
lua.new_usertype<A>("A",
"bark", &A::bark);
lua.script(R"( function f (num_value, a)
return num_value * 2, a:bark()
end
function h (num_value, a, b)
return num_value * 2, a:bark(), b * 3
end
nested = { variables = { no = { problem = 10 } } } )");
lua.set_function("g", bark);
sol::function cpp_bark = lua["g"];
sol::function lua_bark = lua["f"];
sol::function lua_bark2 = lua["h"];
sol::reference lua_variable_x = lua["nested"]["variables"]["no"]["problem"];
A cpp_variable_y;
static const std::tuple<int, int> abdesired(20, 1);
static const std::pair<int, int> cddesired = { 20, 1 };
static const std::tuple<int, int, int> abcdesired(20, 1, 3);
std::tuple<int, int> ab = cpp_bark(lua_variable_x, cpp_variable_y);
std::pair<int, int> cd = lua_bark(lua["nested"]["variables"]["no"]["problem"], cpp_variable_y);
REQUIRE(ab == abdesired);
REQUIRE(cd == cddesired);
ab = cpp_bark(std::make_pair(lua_variable_x, cpp_variable_y));
cd = lua_bark(std::make_pair(lua["nested"]["variables"]["no"]["problem"], cpp_variable_y));
REQUIRE(ab == abdesired);
REQUIRE(cd == cddesired);
std::tuple<int, int, int> abc = lua_bark2(std::make_tuple(10, cpp_variable_y), sol::optional<int>(1));
REQUIRE(abc == abcdesired);
}
TEST_CASE("functions/sol::function-to-std::function", "check if conversion to std::function works properly and calls with correct arguments") {
sol::state lua;
lua.open_libraries(sol::lib::base);
lua.set_function("testFunc", test_free_func);
lua.set_function("testFunc2", test_free_func2);
lua.script(
"testFunc(function() print(\"hello std::function\") end)"
);
REQUIRE_NOTHROW(lua.script(
"function m(a)\n"
" print(\"hello std::function with arg \", a)\n"
" return a\n"
"end\n"
"\n"
"testFunc2(m, 1)"
));
}
TEST_CASE("functions/returning-functions-from-C++-and-gettin-in-lua", "check to see if returning a functor and getting a functor from lua is possible") {
sol::state lua;
lua.open_libraries(sol::lib::base);
lua.set_function("makefn", makefn);
lua.set_function("takefn", takefn);
lua.script("afx = makefn()\n"
"print(afx())\n"
"takefn(afx)\n");
}
TEST_CASE( "functions/function_result-protected_function_result", "Function result should be the beefy return type for sol::function that allows for error checking and error handlers" ) {
sol::state lua;
lua.open_libraries( sol::lib::base, sol::lib::debug );
static const char unhandlederrormessage[] = "true error message";
static const char handlederrormessage[] = "doodle";
static const std::string handlederrormessage_s = handlederrormessage;
// Some function; just using a lambda to be cheap
auto doomfx = []() {
std::cout << "doomfx called" << std::endl;
throw std::runtime_error( unhandlederrormessage );
};
auto luadoomfx = [&lua]() {
std::cout << "luadoomfx called" << std::endl;
// Does not bypass error function, will call it
luaL_error( lua.lua_state(), unhandlederrormessage );
};
lua.set_function("doom", doomfx);
lua.set_function("luadoom", luadoomfx);
auto cpphandlerfx = []( std::string x ) {
std::cout << "c++ handler called with: " << x << std::endl;
return handlederrormessage;
};
lua.set_function( "cpphandler", cpphandlerfx );
lua.script(
std::string( "function luahandler ( message )" )
+ " print('lua handler called with: ' .. message)"
+ " return '" + handlederrormessage + "'"
+ "end"
);
auto nontrampolinefx = [](lua_State*) -> int { throw "x";};
lua_CFunction c_nontrampolinefx = nontrampolinefx;
lua.set("nontrampoline", c_nontrampolinefx);
lua.set_function("bark", []() -> int {return 100;});
sol::protected_function doom = lua[ "doom" ];
sol::protected_function luadoom = lua["luadoom"];
sol::protected_function nontrampoline = lua["nontrampoline"];
sol::protected_function justfine = lua["bark"];
sol::protected_function justfinewithhandler = lua["bark"];
sol::function luahandler = lua["luahandler"];
sol::function cpphandler = lua[ "cpphandler" ];
doom.error_handler = luahandler;
luadoom.error_handler = cpphandler;
nontrampoline.error_handler = cpphandler;
justfinewithhandler.error_handler = luahandler;
bool present = true;
{
sol::protected_function_result result = doom();
REQUIRE_FALSE(result.valid());
sol::optional<sol::error> operr = result;
sol::optional<int> opvalue = result;
present = (bool)operr;
REQUIRE(present);
present = (bool)opvalue;
REQUIRE_FALSE(present);
sol::error err = result;
REQUIRE(err.what() == handlederrormessage_s);
}
{
sol::protected_function_result result = luadoom();
REQUIRE_FALSE(result.valid());
sol::optional<sol::error> operr = result;
sol::optional<int> opvalue = result;
present = (bool)operr;
REQUIRE(present);
present = (bool)opvalue;
REQUIRE_FALSE(present);
sol::error err = result;
REQUIRE(err.what() == handlederrormessage_s);
}
{
sol::protected_function_result result = nontrampoline();
REQUIRE_FALSE(result.valid());
sol::optional<sol::error> operr = result;
sol::optional<int> opvalue = result;
present = (bool)operr;
REQUIRE(present);
present = (bool)opvalue;
REQUIRE_FALSE(present);
sol::error err = result;
REQUIRE(err.what() == handlederrormessage_s);
}
{
sol::protected_function_result result = justfine();
REQUIRE(result.valid());
sol::optional<sol::error> operr = result;
sol::optional<int> opvalue = result;
present = (bool)operr;
REQUIRE_FALSE(present);
present = (bool)opvalue;
REQUIRE(present);
int value = result;
REQUIRE(value == 100);
}
{
sol::protected_function_result result = justfinewithhandler();
REQUIRE(result.valid());
sol::optional<sol::error> operr = result;
sol::optional<int> opvalue = result;
present = (bool)operr;
REQUIRE_FALSE(present);
present = (bool)opvalue;
REQUIRE(present);
int value = result;
REQUIRE(value == 100);
}
}
TEST_CASE("functions/destructor-tests", "Show that proper copies / destruction happens") {
static int created = 0;
static int destroyed = 0;
static void* last_call = nullptr;
static void* static_call = reinterpret_cast<void*>(0x01);
typedef void(* fptr)();
struct x {
x() {++created;}
x(const x&) {++created;}
x(x&&) {++created;}
x& operator=(const x&) {return *this;}
x& operator=(x&&) {return *this;}
void func() {last_call = static_cast<void*>(this);};
~x () {++destroyed;}
};
struct y {
y() {++created;}
y(const x&) {++created;}
y(x&&) {++created;}
y& operator=(const x&) {return *this;}
y& operator=(x&&) {return *this;}
static void func() {last_call = static_call;};
void operator()() {func();}
operator fptr () { return func; }
~y () {++destroyed;}
};
// stateful functors/member functions should always copy unless specified
{
created = 0;
destroyed = 0;
last_call = nullptr;
{
sol::state lua;
x x1;
lua.set_function("x1copy", &x::func, x1);
lua.script("x1copy()");
REQUIRE(created == 2);
REQUIRE(destroyed == 0);
REQUIRE_FALSE(last_call == &x1);
lua.set_function("x1ref", &x::func, std::ref(x1));
lua.script("x1ref()");
REQUIRE(created == 2);
REQUIRE(destroyed == 0);
REQUIRE(last_call == &x1);
}
REQUIRE(created == 2);
REQUIRE(destroyed == 2);
}
// things convertible to a static function should _never_ be forced to make copies
// therefore, pass through untouched
{
created = 0;
destroyed = 0;
last_call = nullptr;
{
sol::state lua;
y y1;
lua.set_function("y1copy", y1);
lua.script("y1copy()");
REQUIRE(created == 1);
REQUIRE(destroyed == 0);
REQUIRE(last_call == static_call);
last_call = nullptr;
lua.set_function("y1ref", std::ref(y1));
lua.script("y1ref()");
REQUIRE(created == 1);
REQUIRE(destroyed == 0);
REQUIRE(last_call == static_call);
}
REQUIRE(created == 1);
REQUIRE(destroyed == 1);
}
}
TEST_CASE("functions/all-kinds", "Register all kinds of functions, make sure they all compile and work") {
sol::state lua;
struct test_1 {
int a = 0xA;
virtual int bark() {
return a;
}
int bark_mem() {
return a;
}
static std::tuple<int, int> x_bark(int num_value, test_1* a) {
return std::tuple<int, int>(num_value * 2, a->a);
}
};
struct test_2 {
int a = 0xC;
int bark() {
return 20;
}
};
struct inner {
const int z = 5653;
};
struct nested {
inner i;
};
auto a = []() { return 500; };
auto b = [&]() { return 501; };
auto c = [&]() { return 502; };
auto d = []() { return 503; };
lua.new_usertype<test_1>("test_1",
"bark", sol::c_call<decltype(&test_1::bark_mem), &test_1::bark_mem>
);
lua.new_usertype<test_2>("test_2",
"bark", sol::c_call<decltype(&test_2::bark), &test_2::bark>
);
test_2 t2;
lua.set_function("a", a);
lua.set_function("b", b);
lua.set_function("c", std::ref(c));
lua.set_function("d", std::ref(d));
lua.set_function("f", &test_1::bark);
lua.set_function("g", test_1::x_bark);
lua.set_function("h", sol::c_call<decltype(&test_1::bark_mem), &test_1::bark_mem>);
lua.set_function("i", &test_2::bark, test_2());
lua.set_function("j", &test_2::a, test_2());
lua.set_function("k", &test_2::a);
lua.set_function("l", sol::c_call<decltype(&test_1::a), &test_1::a>);
lua.set_function("m", &test_2::a, &t2);
lua.set_function("n", sol::c_call<decltype(&non_overloaded), &non_overloaded>);
lua.script(R"(
o1 = test_1.new()
o2 = test_2.new()
ob = o1:bark()
A = a()
B = b()
C = c()
D = d()
F = f(o1)
G0, G1 = g(2, o1)
H = h(o1)
I = i(o1)
I = i(o1)
J0 = j()
j(24)
J1 = j()
K0 = k(o2)
k(o2, 1024)
K1 = k(o2)
L0 = l(o1)
l(o1, 678)
L1 = l(o1)
M0 = m()
m(256)
M1 = m()
N = n(1, 2, 3)
)");
int ob, A, B, C, D, F, G0, G1, H, I, J0, J1, K0, K1, L0, L1, M0, M1, N;
std::tie( ob, A, B, C, D, F, G0, G1, H, I, J0, J1, K0, K1, L0, L1, M0, M1, N )
= lua.get<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>(
"ob", "A", "B", "C", "D", "F", "G0", "G1", "H", "I", "J0", "J1", "K0", "K1", "L0", "L1", "M0", "M1", "N"
);
REQUIRE(ob == 0xA);
REQUIRE( A == 500 );
REQUIRE( B == 501 );
REQUIRE( C == 502 );
REQUIRE( D == 503 );
REQUIRE( F == 0xA );
REQUIRE( G0 == 4 );
REQUIRE( G1 == 0xA );
REQUIRE( H == 0xA );
REQUIRE( I == 20 );
REQUIRE( J0 == 0xC );
REQUIRE( J1 == 24 );
REQUIRE( K0 == 0xC );
REQUIRE( K1 == 1024 );
REQUIRE( L0 == 0xA );
REQUIRE( L1 == 678 );
REQUIRE( M0 == 0xC );
REQUIRE( M1 == 256 );
REQUIRE( N == 13 );
sol::tie( ob, A, B, C, D, F, G0, G1, H, I, J0, J1, K0, K1, L0, L1, M0, M1, N )
= lua.get<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>(
"ob", "A", "B", "C", "D", "F", "G0", "G1", "H", "I", "J0", "J1", "K0", "K1", "L0", "L1", "M0", "M1", "N"
);
REQUIRE(ob == 0xA);
REQUIRE( A == 500 );
REQUIRE( B == 501 );
REQUIRE( C == 502 );
REQUIRE( D == 503 );
REQUIRE( F == 0xA );
REQUIRE( G0 == 4 );
REQUIRE( G1 == 0xA );
REQUIRE( H == 0xA );
REQUIRE( I == 20 );
REQUIRE( J0 == 0xC );
REQUIRE( J1 == 24 );
REQUIRE( K0 == 0xC );
REQUIRE( K1 == 1024 );
REQUIRE( L0 == 0xA );
REQUIRE( L1 == 678 );
REQUIRE( M0 == 0xC );
REQUIRE( M1 == 256 );
REQUIRE( N == 13 );
// Work that compiler, WORK IT!
lua.set("o", &test_1::bark);
lua.set("p", test_1::x_bark);
lua.set("q", sol::c_call<decltype(&test_1::bark_mem), &test_1::bark_mem>);
lua.set("r", &test_2::a);
lua.set("s", sol::readonly(&test_2::a));
lua.set_function("t", sol::readonly(&test_2::a), test_2());
lua.set_function("u", &nested::i, nested());
lua.set("v", &nested::i);
lua.set("nested", nested());
lua.set("inner", inner());
REQUIRE_THROWS(lua.script("s(o2, 2)"));
REQUIRE_THROWS(lua.script("t(2)"));
REQUIRE_THROWS(lua.script("u(inner)"));
REQUIRE_THROWS(lua.script("v(nested, inner)"));
}
TEST_CASE("simple/call-with-parameters", "Lua function is called with a few parameters from C++") {
sol::state lua;
REQUIRE_NOTHROW(lua.script("function my_add(i, j, k) return i + j + k end"));
auto f = lua.get<sol::function>("my_add");
REQUIRE_NOTHROW(lua.script("function my_nothing(i, j, k) end"));
auto fvoid = lua.get<sol::function>("my_nothing");
int a;
REQUIRE_NOTHROW(fvoid(1, 2, 3));
REQUIRE_NOTHROW(a = f.call<int>(1, 2, 3));
REQUIRE(a == 6);
REQUIRE_THROWS(a = f(1, 2, "arf"));
}
TEST_CASE("simple/call-c++-function", "C++ function is called from lua") {
sol::state lua;
lua.set_function("plop_xyz", sep::plop_xyz);
lua.script("x = plop_xyz(2, 6, 'hello')");
REQUIRE(lua.get<int>("x") == 11);
}
TEST_CASE("simple/call-lambda", "A C++ lambda is exposed to lua and called") {
sol::state lua;
int a = 0;
lua.set_function("foo", [&a] { a = 1; });
lua.script("foo()");
REQUIRE(a == 1);
}
TEST_CASE("advanced/get-and-call", "Checks for lambdas returning values after a get operation") {
const static std::string lol = "lol", str = "str";
const static std::tuple<int, float, double, std::string> heh_tuple = std::make_tuple(1, 6.28f, 3.14, std::string("heh"));
sol::state lua;
REQUIRE_NOTHROW(lua.set_function("a", [] { return 42; }));
REQUIRE(lua.get<sol::function>("a").call<int>() == 42);
REQUIRE_NOTHROW(lua.set_function("b", [] { return 42u; }));
REQUIRE(lua.get<sol::function>("b").call<unsigned int>() == 42u);
REQUIRE_NOTHROW(lua.set_function("c", [] { return 3.14; }));
REQUIRE(lua.get<sol::function>("c").call<double>() == 3.14);
REQUIRE_NOTHROW(lua.set_function("d", [] { return 6.28f; }));
REQUIRE(lua.get<sol::function>("d").call<float>() == 6.28f);
REQUIRE_NOTHROW(lua.set_function("e", [] { return "lol"; }));
REQUIRE(lua.get<sol::function>("e").call<std::string>() == lol);
REQUIRE_NOTHROW(lua.set_function("f", [] { return true; }));
REQUIRE(lua.get<sol::function>("f").call<bool>());
REQUIRE_NOTHROW(lua.set_function("g", [] { return std::string("str"); }));
REQUIRE(lua.get<sol::function>("g").call<std::string>() == str);
REQUIRE_NOTHROW(lua.set_function("h", [] { }));
REQUIRE_NOTHROW(lua.get<sol::function>("h").call());
REQUIRE_NOTHROW(lua.set_function("i", [] { return sol::nil; }));
REQUIRE(lua.get<sol::function>("i").call<sol::nil_t>() == sol::nil);
REQUIRE_NOTHROW(lua.set_function("j", [] { return std::make_tuple(1, 6.28f, 3.14, std::string("heh")); }));
REQUIRE((lua.get<sol::function>("j").call<int, float, double, std::string>() == heh_tuple));
}
TEST_CASE("advanced/operator[]-call", "Checks for lambdas returning values using operator[]") {
const static std::string lol = "lol", str = "str";
const static std::tuple<int, float, double, std::string> heh_tuple = std::make_tuple(1, 6.28f, 3.14, std::string("heh"));
sol::state lua;
REQUIRE_NOTHROW(lua.set_function("a", [] { return 42; }));
REQUIRE(lua["a"].call<int>() == 42);
REQUIRE_NOTHROW(lua.set_function("b", [] { return 42u; }));
REQUIRE(lua["b"].call<unsigned int>() == 42u);
REQUIRE_NOTHROW(lua.set_function("c", [] { return 3.14; }));
REQUIRE(lua["c"].call<double>() == 3.14);
REQUIRE_NOTHROW(lua.set_function("d", [] { return 6.28f; }));
REQUIRE(lua["d"].call<float>() == 6.28f);
REQUIRE_NOTHROW(lua.set_function("e", [] { return "lol"; }));
REQUIRE(lua["e"].call<std::string>() == lol);
REQUIRE_NOTHROW(lua.set_function("f", [] { return true; }));
REQUIRE(lua["f"].call<bool>());
REQUIRE_NOTHROW(lua.set_function("g", [] { return std::string("str"); }));
REQUIRE(lua["g"].call<std::string>() == str);
REQUIRE_NOTHROW(lua.set_function("h", [] { }));
REQUIRE_NOTHROW(lua["h"].call());
REQUIRE_NOTHROW(lua.set_function("i", [] { return sol::nil; }));
REQUIRE(lua["i"].call<sol::nil_t>() == sol::nil);
REQUIRE_NOTHROW(lua.set_function("j", [] { return std::make_tuple(1, 6.28f, 3.14, std::string("heh")); }));
REQUIRE((lua["j"].call<int, float, double, std::string>() == heh_tuple));
}
TEST_CASE("advanced/call-lambdas", "A C++ lambda is exposed to lua and called") {
sol::state lua;
int x = 0;
lua.set_function("set_x", [&] (int new_x) {
x = new_x;
return 0;
});
lua.script("set_x(9)");
REQUIRE(x == 9);
}
TEST_CASE("advanced/call-referenced_obj", "A C++ object is passed by pointer/reference_wrapper to lua and invoked") {
sol::state lua;
int x = 0;
auto objx = [&](int new_x) {
x = new_x;
return 0;
};
lua.set_function("set_x", std::ref(objx));
int y = 0;
auto objy = [&](int new_y) {
y = new_y;
return std::tuple<int, int>(0, 0);
};
lua.set_function("set_y", &decltype(objy)::operator(), std::ref(objy));
lua.script("set_x(9)");
lua.script("set_y(9)");
REQUIRE(x == 9);
REQUIRE(y == 9);
}
TEST_CASE("functions/tie", "make sure advanced syntax with 'tie' works") {
sol::state lua;
lua.script(R"(function f ()
return 1, 2, 3
end)");
sol::function f = lua["f"];
int a, b, c;
sol::tie(a, b, c) = f();
REQUIRE(a == 1);
REQUIRE(b == 2);
REQUIRE(c == 3);
}
TEST_CASE("functions/variadic_args", "Check to see we can receive multiple arguments through a variadic") {
struct structure {
int x;
bool b;
};
sol::state lua;
lua.open_libraries(sol::lib::base);
lua.set_function("v", [](sol::this_state, sol::variadic_args va) -> structure {
int r = 0;
for (auto v : va) {
int value = v;
r += value;
}
return{ r, r > 200 };
});
lua.script("x = v(25, 25)");
lua.script("x2 = v(25, 25, 100, 50, 250, 150)");
lua.script("x3 = v(1, 2, 3, 4, 5, 6)");
structure& lx = lua["x"];
structure& lx2 = lua["x2"];
structure& lx3 = lua["x3"];
REQUIRE(lx.x == 50);
REQUIRE(lx2.x == 600);
REQUIRE(lx3.x == 21);
REQUIRE_FALSE(lx.b);
REQUIRE(lx2.b);
REQUIRE_FALSE(lx3.b);
}
TEST_CASE("functions/required_and_variadic_args", "Check if a certain number of arguments can still be required even when using variadic_args") {
sol::state lua;
lua.set_function("v", [](sol::this_state, sol::variadic_args, int, int) {});
REQUIRE_NOTHROW(lua.script("v(20, 25, 30)"));
REQUIRE_NOTHROW(lua.script("v(20, 25)"));
REQUIRE_THROWS(lua.script("v(20)"));
}
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