mirror of
https://github.com/boostorg/lambda.git
synced 2026-01-21 04:52:25 +00:00
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
// is_convertible_to_template_test.cpp ----------------------------
|
|
|
|
#define BOOST_INCLUDE_MAIN // for testing, include rather than link
|
|
#include <boost/test/test_tools.hpp> // see "Header Implementation Option"
|
|
|
|
|
|
#include "boost/lambda/detail/is_instance_of.hpp"
|
|
|
|
#include <iostream>
|
|
|
|
template <class T1> struct A1 {};
|
|
template <class T1, class T2> struct A2 {};
|
|
template <class T1, class T2, class T3> struct A3 {};
|
|
template <class T1, class T2, class T3, class T4> struct A4 {};
|
|
|
|
class B1 : public A1<int> {};
|
|
class B2 : public A2<int,int> {};
|
|
class B3 : public A3<int,int,int> {};
|
|
class B4 : public A4<int,int,int,int> {};
|
|
|
|
// classes that are convertible to classes that derive from A instances
|
|
// This is not enough to make the test succeed
|
|
|
|
class C1 { public: operator A1<int>() { return A1<int>(); } };
|
|
class C2 { public: operator B2() { return B2(); } };
|
|
class C3 { public: operator B3() { return B3(); } };
|
|
class C4 { public: operator B4() { return B4(); } };
|
|
|
|
// test that the result is really a constant
|
|
// (in an alternative implementation, gcc 3.0.2. claimed that it was
|
|
// a non-constant)
|
|
template <bool b> class X {};
|
|
// this should compile
|
|
X<boost::lambda::is_instance_of_2<int, A2>::value> x;
|
|
|
|
|
|
int test_main(int, char *[]) {
|
|
|
|
using boost::lambda::is_instance_of_1;
|
|
using boost::lambda::is_instance_of_2;
|
|
using boost::lambda::is_instance_of_3;
|
|
using boost::lambda::is_instance_of_4;
|
|
|
|
|
|
BOOST_TEST((is_instance_of_1<B1, A1>::value == true));
|
|
BOOST_TEST((is_instance_of_1<A1<float>, A1>::value == true));
|
|
BOOST_TEST((is_instance_of_1<int, A1>::value == false));
|
|
BOOST_TEST((is_instance_of_1<C1, A1>::value == false));
|
|
|
|
BOOST_TEST((is_instance_of_2<B2, A2>::value == true));
|
|
BOOST_TEST((is_instance_of_2<A2<int, float>, A2>::value == true));
|
|
BOOST_TEST((is_instance_of_2<int, A2>::value == false));
|
|
BOOST_TEST((is_instance_of_2<C2, A2>::value == false));
|
|
|
|
BOOST_TEST((is_instance_of_3<B3, A3>::value == true));
|
|
BOOST_TEST((is_instance_of_3<A3<int, float, char>, A3>::value == true));
|
|
BOOST_TEST((is_instance_of_3<int, A3>::value == false));
|
|
BOOST_TEST((is_instance_of_3<C3, A3>::value == false));
|
|
|
|
BOOST_TEST((is_instance_of_4<B4, A4>::value == true));
|
|
BOOST_TEST((is_instance_of_4<A4<int, float, char, double>, A4>::value == true));
|
|
BOOST_TEST((is_instance_of_4<int, A4>::value == false));
|
|
BOOST_TEST((is_instance_of_4<C4, A4>::value == false));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|