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Merge pull request #272 from boostorg/nodiscard

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Add support for [[nodiscard]]
This commit is contained in:
jzmaddock
2019-04-02 13:24:34 +01:00
committed by GitHub
parent b68cf2b660 9c829919aa
commit fb746fc6fb
3 changed files with 16 additions and 0 deletions
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2
doc/macro_reference.qbk
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@@ -1275,6 +1275,8 @@ Usage example:
]] ]]
[[`BOOST_ATTRIBUTE_UNUSED`][Expands to `__attribute__((unused))` when this is available - [[`BOOST_ATTRIBUTE_UNUSED`][Expands to `__attribute__((unused))` when this is available -
can be used to disable compiler warnings relating to unused types or variables.]] can be used to disable compiler warnings relating to unused types or variables.]]
[[`BOOST_ATTRIBUTE_NODISCARD`][Expands to `[[nodiscard]]` when this is available -
can be used to create a warning when a type or variable is unused.]]
[[`BOOST_MAY_ALIAS`, `BOOST_NO_MAY_ALIAS`][ [[`BOOST_MAY_ALIAS`, `BOOST_NO_MAY_ALIAS`][
`BOOST_MAY_ALIAS` expands to a type attribute that can be used to mark types that may `BOOST_MAY_ALIAS` expands to a type attribute that can be used to mark types that may
alias other types. Pointers or references to such marked types can be used to access objects alias other types. Pointers or references to such marked types can be used to access objects

11
include/boost/config/detail/suffix.hpp
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@@ -992,6 +992,17 @@ namespace std{ using ::type_info; }
#ifndef BOOST_ATTRIBUTE_UNUSED #ifndef BOOST_ATTRIBUTE_UNUSED
# define BOOST_ATTRIBUTE_UNUSED # define BOOST_ATTRIBUTE_UNUSED
#endif #endif
//
// [[nodiscard]]:
//
#ifdef __has_cpp_attribute
#if __has_cpp_attribute(nodiscard)
# define BOOST_ATTRIBUTE_NODISCARD [[nodiscard]]
#endif
#endif
#ifndef BOOST_ATTRIBUTE_NODISCARD
# define BOOST_ATTRIBUTE_NODISCARD
#endif
#define BOOST_STATIC_CONSTEXPR static BOOST_CONSTEXPR_OR_CONST #define BOOST_STATIC_CONSTEXPR static BOOST_CONSTEXPR_OR_CONST

3
test/helper_macro_test.cpp
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@@ -37,6 +37,8 @@ BOOST_NORETURN void always_throw()
struct BOOST_MAY_ALIAS aliasing_struct {}; struct BOOST_MAY_ALIAS aliasing_struct {};
typedef unsigned int BOOST_MAY_ALIAS aliasing_uint; typedef unsigned int BOOST_MAY_ALIAS aliasing_uint;
struct BOOST_ATTRIBUTE_NODISCARD nodiscard_struct {};
#define test_fallthrough(x) foobar(x) #define test_fallthrough(x) foobar(x)
@@ -53,6 +55,7 @@ int main()
result += never_inline(3); result += never_inline(3);
if(BOOST_UNLIKELY(!result)) if(BOOST_UNLIKELY(!result))
always_throw(); always_throw();
nodiscard_struct s;
} }
catch(int) catch(int)
{ {