blob: 53495a089adf968cd98b298e597712270bf7a935 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
#ifndef BOOST_CONTRACT_DETAIL_STATIC_LOCAL_VAR_HPP_
#define BOOST_CONTRACT_DETAIL_STATIC_LOCAL_VAR_HPP_
// Copyright (C) 2008-2018 Lorenzo Caminiti
// Distributed under the Boost Software License, Version 1.0 (see accompanying
// file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
// See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
namespace boost { namespace contract { namespace detail {
// This is used to hold the state of this library (already checking assertions,
// failure handers, mutexes, etc.). Local static variables are used instead of
// global or class-level static variables to avoid ODR errors when this library
// is used as header-only.
// Use T's default constructor to init the local var.
template<typename Tag, typename T>
struct static_local_var {
static T& ref() {
static T data;
return data;
}
};
// Use `init` param to init local var (Init same as or convertible to T).
// NOTE: Template specializations could be used to program both this and the
// template above together but some pre-C++11 compilers give errors (e.g., Clang
// without -std=c++11), plus the `_init` postfix is more readable at call site.
template<typename Tag, typename T, typename Init, Init init>
struct static_local_var_init {
static T& ref() {
static T data = init;
return data;
}
};
} } } // namespace
#endif // #include guard
|
