Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 1 | /** |
| 2 | * @file generic_spec.h |
| 3 | * Container holding an item or a special "match all" item |
| 4 | * |
| 5 | * @remark Copyright 2003 OProfile authors |
| 6 | * @remark Read the file COPYING |
| 7 | * |
| 8 | * @author John Levon |
| 9 | * @author Philippe Elie |
| 10 | */ |
| 11 | |
| 12 | #ifndef GENERIC_SPEC_H |
| 13 | #define GENERIC_SPEC_H |
| 14 | |
| 15 | #include <stdexcept> |
| 16 | #include <string> |
| 17 | #include <sstream> |
| 18 | |
| 19 | #include "string_manip.h" |
| 20 | |
| 21 | |
| 22 | /** |
| 23 | * used to hold something like { int cpu_nr, bool is_all }; |
| 24 | * to store a sub part of a samples filename see PP:3.21. |
| 25 | */ |
| 26 | template <class T> |
| 27 | class generic_spec |
| 28 | { |
| 29 | public: |
| 30 | /** |
| 31 | * build a default spec which match anything |
| 32 | */ |
| 33 | generic_spec(); |
| 34 | |
| 35 | /// build a spec from a string, valid argument are "all" |
| 36 | /// or a string convertible to T through istringtream(str) >> data |
| 37 | /// conversion is strict, no space are allowed at begin or end of str |
| 38 | void set(std::string const &); |
| 39 | |
| 40 | /// return true if a specific value is held by this container |
| 41 | bool is_set() const { |
| 42 | return !is_all; |
| 43 | } |
| 44 | |
| 45 | /// return the specific value (only if is_set() == true) |
| 46 | T const value() const { |
| 47 | if (!is_all) |
| 48 | return data; |
| 49 | throw std::out_of_range("generic_spec holds no value"); |
| 50 | } |
| 51 | |
| 52 | /// return true if rhs match this spec. Sub part of PP:3.24 |
| 53 | bool match(T const & rhs) const { |
| 54 | return rhs == data; |
| 55 | } |
| 56 | |
| 57 | /// return true if rhs match this spec. Sub part of PP:3.24 |
| 58 | bool match(generic_spec<T> const & rhs) const { |
| 59 | return is_all || rhs.is_all || rhs.data == data; |
| 60 | } |
| 61 | |
| 62 | private: |
| 63 | T data; |
| 64 | bool is_all; |
| 65 | }; |
| 66 | |
| 67 | |
| 68 | template <class T> |
| 69 | generic_spec<T>::generic_spec() |
| 70 | : |
| 71 | data(T()), |
| 72 | is_all(true) |
| 73 | { |
| 74 | } |
| 75 | |
| 76 | |
| 77 | template <class T> |
| 78 | void generic_spec<T>::set(std::string const & str) |
| 79 | { |
| 80 | if (str == "all") { |
| 81 | is_all = true; |
| 82 | return; |
| 83 | } |
| 84 | |
| 85 | is_all = false; |
| 86 | data = op_lexical_cast<T>(str); |
| 87 | } |
| 88 | |
| 89 | |
| 90 | /// We don't use generic_spec<string>, since it's probably an error to try |
| 91 | /// to use generic_spec<string> we specialize but don't define it to get a |
| 92 | /// link error (using generic_spec<string> is problematic because g.set("all") |
| 93 | /// is ambiguous) |
| 94 | template <> |
| 95 | void generic_spec<std::string>::set(std::string const & str); |
| 96 | |
| 97 | #endif /* !GENERIC_SPEC_H */ |