Imported Upstream version 1.72.0
[platform/upstream/boost.git] / libs / contract / test / call_if / no_equal_error.cpp
1
2 // Copyright (C) 2008-2018 Lorenzo Caminiti
3 // Distributed under the Boost Software License, Version 1.0 (see accompanying
4 // file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
5 // See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
6
7 // Test assertion error when operations to check them missing (e.g., `==`).
8
9 #include <boost/contract/function.hpp>
10 #include <boost/contract/check.hpp>
11 #include <boost/contract/assert.hpp>
12 #include <vector>
13
14 template<typename T>
15 void push_back(std::vector<T>& vect, T const& value) {
16     boost::contract::check c = boost::contract::function()
17         .postcondition([&] {
18             BOOST_CONTRACT_ASSERT(vect.back() == value); // Error (j has no ==).
19             #ifdef BOOST_CONTRACT_NO_ALL
20                 #error "force error if no contracts (ASSERT expands to nothing)"
21             #endif
22         })
23     ;
24     vect.push_back(value);
25 }
26
27 struct j { // Type without operator==.
28     explicit j(int /* i */) {}
29 };
30
31 int main() {
32     std::vector<int> vi;
33     push_back(vi, 123);
34
35     j jj(456);
36     std::vector<j> vj;
37     push_back(vj, jj);
38
39     return 0;
40 }
41