1 /*=============================================================================
2     Boost.Wave: A Standard compliant C++ preprocessor library
3 
4     http://www.boost.org/
5 
6     Copyright (c) 2001-2012 Hartmut Kaiser. Distributed under the Boost
7     Software License, Version 1.0. (See accompanying file
8     LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9 =============================================================================*/
10 
11 #if !defined(ITERATION_CONTEXT_HPP_9556CD16_F11E_4ADC_AC8B_FB9A174BE664_INCLUDED)
12 #define ITERATION_CONTEXT_HPP_9556CD16_F11E_4ADC_AC8B_FB9A174BE664_INCLUDED
13 
14 #include <cstdlib>
15 #include <cstdio>
16 #include <stack>
17 
18 #include <boost/wave/wave_config.hpp>
19 #include <boost/wave/cpp_exceptions.hpp>
20 
21 // this must occur after all of the includes and before any code appears
22 #ifdef BOOST_HAS_ABI_HEADERS
23 #include BOOST_ABI_PREFIX
24 #endif
25 
26 ///////////////////////////////////////////////////////////////////////////////
27 namespace boost {
28 namespace wave {
29 namespace util {
30 
31 ///////////////////////////////////////////////////////////////////////////////
32 template <typename IterationContextT>
33 class iteration_context_stack
34 {
35     typedef std::stack<IterationContextT> base_type;
36 
37 public:
38     typedef typename base_type::size_type size_type;
39 
iteration_context_stack()40     iteration_context_stack()
41     :   max_include_nesting_depth(BOOST_WAVE_MAX_INCLUDE_LEVEL_DEPTH)
42     {}
43 
set_max_include_nesting_depth(size_type new_depth)44     void set_max_include_nesting_depth(size_type new_depth)
45         {  max_include_nesting_depth = new_depth; }
get_max_include_nesting_depth() const46     size_type get_max_include_nesting_depth() const
47         { return max_include_nesting_depth; }
48 
size() const49     typename base_type::size_type size() const { return iter_ctx.size(); }
top()50     typename base_type::value_type &top() { return iter_ctx.top(); }
pop()51     void pop() { iter_ctx.pop(); }
52 
53     template <typename Context, typename PositionT>
push(Context & ctx,PositionT const & pos,typename base_type::value_type const & val)54     void push(Context& ctx, PositionT const &pos,
55         typename base_type::value_type const &val)
56     {
57         if (iter_ctx.size() == max_include_nesting_depth) {
58         char buffer[22];    // 21 bytes holds all NUL-terminated unsigned 64-bit numbers
59 
60             using namespace std;    // for some systems sprintf is in namespace std
61             sprintf(buffer, "%d", (int)max_include_nesting_depth);
62             BOOST_WAVE_THROW_CTX(ctx, preprocess_exception,
63                 include_nesting_too_deep, buffer, pos);
64         }
65         iter_ctx.push(val);
66     }
67 
68 private:
69     size_type max_include_nesting_depth;
70     base_type iter_ctx;
71 };
72 
73 ///////////////////////////////////////////////////////////////////////////////
74 }   // namespace util
75 }   // namespace wave
76 }   // namespace boost
77 
78 // the suffix header occurs after all of the code
79 #ifdef BOOST_HAS_ABI_HEADERS
80 #include BOOST_ABI_SUFFIX
81 #endif
82 
83 #endif // !defined(ITERATION_CONTEXT_HPP_9556CD16_F11E_4ADC_AC8B_FB9A174BE664_INCLUDED)
84