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e6f6c369ff
ref https://en.cppreference.com/w/cpp/error/exception/what > Pointer to a null-terminated string with explanatory information. The pointer is guaranteed to be valid at least until the exception object from which it is obtained is destroyed, or until a non-const member function on the exception object is called. The pointer is only valid before `CStdException as e` is destroyed Old examples are broken on macOS arm64 ``` /Users/blue/Desktop/nimony/test4.nim(38) test4 /Users/blue/Desktop/nimony/test4.nim(26) fn /Users/blue/.choosenim/toolchains/nim-#devel/lib/std/assertions.nim(41) failedAssertImpl /Users/blue/.choosenim/toolchains/nim-#devel/lib/std/assertions.nim(36) raiseAssert /Users/blue/.choosenim/toolchains/nim-#devel/lib/system/fatal.nim(53) sysFatal Error: unhandled exception: /Users/blue/Desktop/nimony/test4.nim(26, 3) `$b == "foo2"` [AssertionDefect] ```
37 lines
1.1 KiB
Nim
37 lines
1.1 KiB
Nim
discard """
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targets: cpp
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"""
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# manual example
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type
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CStdException {.importcpp: "std::exception", header: "<exception>", inheritable.} = object
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## does not inherit from `RootObj`, so we use `inheritable` instead
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CRuntimeError {.requiresInit, importcpp: "std::runtime_error", header: "<stdexcept>".} = object of CStdException
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## `CRuntimeError` has no default constructor => `requiresInit`
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proc what(s: CStdException): cstring {.importcpp: "((char *)#.what())".}
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proc initRuntimeError(a: cstring): CRuntimeError {.importcpp: "std::runtime_error(@)", constructor.}
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proc initStdException(): CStdException {.importcpp: "std::exception()", constructor.}
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proc fn() =
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let a = initRuntimeError("foo")
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doAssert $a.what == "foo"
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var b = ""
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try: raise initRuntimeError("foo2")
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except CStdException as e:
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doAssert e is CStdException
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b = $e.what()
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doAssert b == "foo2"
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try: raise initStdException()
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except CStdException: discard
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try: raise initRuntimeError("foo3")
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except CRuntimeError as e:
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b = $e.what()
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except CStdException:
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doAssert false
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doAssert b == "foo3"
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fn()
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