Questions tagged [exception-specification]
47 questions
35
votes
1 answer
Questions about Hinnant's stack allocator
I've been using Howard Hinnant's stack allocator and it works like a charm, but some details of the implementation are a little unclear to me.
Why are global operators new and delete used? The allocate() and deallocate() member functions use…
TemplateRex
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21
votes
5 answers
c++1z dynamic exception specification error
I am trying to compile my project with new GCC version 7.2.1 and have a problem with dynamic exception specifications:
error: ISO C++1z does not allow dynamic exception specifications
MEMORY_ALLOC_OPERATORS(SQLException)
The problem is that these…
Pustovalov Dmitry
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17
votes
2 answers
How can std::runtime_error::runtime_error(const std::string&) meet std::exception's requirement of throw()?
std::exception requires that its constructor be throw(). Yet std::runtime_error accepts a std::string as its argument, which indicates that it's storing a std::string somewhere. Therefore, an assignment or copy construction has to be going on…
Billy ONeal
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16
votes
3 answers
Exception Specification
I know that this feature will be deprecated in C++0x, but for me as a total novice it seems like a good idea to have it. Could anyone explain to me why isn't a good idea?
There is nothing we can do
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14
votes
1 answer
Is there any point in declaring a deleted function as noexcept?
Consider these two possible definitions for a class:
Exhibit A:
struct A
{
A() = delete;
};
Exhibit A′:
struct A
{
A() noexcept = delete;
}
Is there any point in declaring a deleted function as noexcept?
user2296177
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14
votes
1 answer
How does an exception specification affect virtual destructor overriding?
The C++ Standard states the following about virtual functions that have exception specifications:
If a virtual function has an exception-specification, all declarations, including the definition, of any function that overrides that virtual function…
James McNellis
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12
votes
1 answer
Why std::map find() is not declared as noexcept?
C++14 standard defines the find() member functions of std::map as follows:
iterator find(const key_type& x);
const_iterator find(const key_type& x) const;
Why are these functions not defined as noexcept? What could possibly go wrong inside, that…
PowerGamer
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12
votes
3 answers
Transitioning to C++11 where destructors are implicitly declared with noexcept
In C++11, a destructor without any exception specification is implicitly declared with noexcept, which is a change from C++03. Therefore, a code which used to throw from destructors in C++03 would still compile fine in C++11, but will crash at…
dragonroot
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10
votes
2 answers
Why are C++ exception specifications not checked at compile-time?
I just read that in the C++11 standard revision, exception specifications were deprecated. I previously thought specifying what your functions may throw is good practice, but apparently, not so.
After reading Herb Stutter's well-cited article, I…
Taral
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10
votes
11 answers
Is there a generally accepted idiom for indicating C++ code can throw exceptions?
I have seen problems when using C++ code that, unexpectedly to the caller, throws an exception. It's not always possible or practical to read every line of a module that you are using to see if it throws exceptions and if so, what type of…
David Coufal
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9
votes
1 answer
Exception specifications when deriving from std::exception in C++11
I have an exception class as follows:
#include
struct InvalidPathException : public std::exception
{
explicit InvalidPathException() {}
const char* what() const;
};
const char*
InvalidPathException::what() const {
return…
beldaz
- 4,299
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9
votes
2 answers
What is the exception specification for a defaulted virtual destructor in C++11?
Suppose I have:
class Foo
{
public:
virtual ~Foo()=default;
};
What is the exception-specification on the defaulted destructor? Is the defaulted destructor equivalent to:
virtual ~Foo() {};
or
virtual ~Foo() throw() {};
or
virtual…
user1414050
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- 2
7
votes
2 answers
How to get rid of "C++ exception specification ignored" warning
I recently got a dll that has been implemented by others. I have to use it in my application. In the header file of their class they have the function declaration
void func1() throw (CCustomException);
Now when i compile it am getting the…
liaK
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7
votes
2 answers
Exception specification when overriding a virtual function
Consider the following code:
class A
{
public:
virtual void f() throw ( int ) { }
};
class B: public A
{
public:
void f() throw ( int, double ) { }
};
When compiled, it says that derived class B has a looser throw specifier compared to A.…
jasonline
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5
votes
1 answer
Exception specification in ˋtypedefˋ completely forbidden or only at toplevel?
In C++14 Sec 15.4;2 it is stated, that ... An exception-specification shall not appear in a typedef declaration or alias-declaration.
That means the following is forbidden:
typedef void (*fn)(int) noexcept;
But does the the wording shall not appear…
chi
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