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Difference between revisions of "cpp/memory/new/bad array new length"

From cppreference.com
< cpp‎ | memory‎ | new
(+inheritance diagram)
m (std::bad_array_new_length &e -> std::bad_array_new_length& e)
 
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{{cpp/title|bad_array_new_length}}
 
{{cpp/title|bad_array_new_length}}
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{{cpp/memory/new/bad_array_new_length/navbar}}
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{{cpp/memory/new/navbar}}
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{{ddcl list begin}}
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{{dcl begin}}
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{{ddcl list header | new}}
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{{dcl header|new}}
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{{ddcl list item | notes={{mark since c++11}} | 1=
+
{{dcl|since=c++11|1=
 
class bad_array_new_length;
 
class bad_array_new_length;
 
}}
 
}}
−
{{ddcl list end}}
+
{{dcl end}}
  
 
{{tt|std::bad_array_new_length}} is the type of the object thrown as exceptions by the [[cpp/language/new|new-expressions]] to report invalid array lengths if
 
{{tt|std::bad_array_new_length}} is the type of the object thrown as exceptions by the [[cpp/language/new|new-expressions]] to report invalid array lengths if
  
−
1) array length is negative
+
# Array length is negative,
−
 
+
# Total size of the new array would exceed implementation-defined maximum value,
−
2) total size of the new array would exceed implementation-defined maximum value
+
# The number of initializer-clauses exceeds the number of elements to initialize.
−
 
+
−
3) the number of initializer-clauses exceeds the number of elements to initialize
+
  
 
Only the first array dimension may generate this exception; dimensions other than the first are constant expressions and are checked at compile time.
 
Only the first array dimension may generate this exception; dimensions other than the first are constant expressions and are checked at compile time.
Line 21: Line 19:
  
 
===Member functions===
 
===Member functions===
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{{dcl list begin}}
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{{cpp/error/exception/member of derived|bad_array_new_length|std=c++11}}
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{{dcl list mem ctor | cpp/memory/new/bad_array_new_length/bad_array_new_length | constructs the {{tt|bad_array_new_length}} object}}
+
−
{{dcl list end}}
+
  
 
{{cpp/memory/new/bad_alloc/inherit}}
 
{{cpp/memory/new/bad_alloc/inherit}}
 +
 
{{cpp/error/exception/inherit}}
 
{{cpp/error/exception/inherit}}
−
 
−
===Notes===
 
−
The override for the virtual member function {{tt|what()}} may by provided, but is not required.
 
  
 
===Example===
 
===Example===
 
{{example
 
{{example
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| Three conditions where {{c|std::bad_array_new_length}} should be thrown:
+
|Three conditions where {{tt|std::bad_array_new_length}} should be thrown:
−
| code=
+
|code=
 +
#include <climits>
 
#include <iostream>
 
#include <iostream>
 
#include <new>
 
#include <new>
−
#include <climits>
 
  
 
int main()
 
int main()
 
{
 
{
−
     int negative = -1;
+
     try
−
     int small = 1;
+
     {
−
    int large = INT_MAX;
+
         int negative = -1;
−
    try {
+
         new int[negative];
−
         new int[negative];          // negative size
+
−
        new int[small]{1,2,3};       // too many initializers
+
−
         new int[large][1000000];    // too large
+
−
    } catch(const std::bad_array_new_length &e) {
+
−
        std::cout << e.what() << '\n';
+
 
     }
 
     }
 +
    catch (const std::bad_array_new_length& e)
 +
    {
 +
        std::cout << "1) " << e.what() << ": negative size\n";
 +
    }
 +
   
 +
    try
 +
    {
 +
        int small = 1;
 +
        new int[small]{1,2,3};
 +
    }
 +
    catch (const std::bad_array_new_length& e)
 +
    {
 +
        std::cout << "2) " << e.what() << ": too many initializers\n";
 +
    }
 +
   
 +
    try
 +
    {
 +
        long large = LONG_MAX;
 +
        new int[large][1000];
 +
    }
 +
    catch (const std::bad_array_new_length& e)
 +
    {
 +
        std::cout << "3) " << e.what() << ": too large\n";
 +
    }
 +
 +
    std::cout << "End\n";
 
}
 
}
 +
|p=true
 +
|output=
 +
1) std::bad_array_new_length: negative size
 +
2) std::bad_array_new_length: too many initializers
 +
3) std::bad_array_new_length: too large
 +
End
 
}}
 
}}
  
 
===See also===
 
===See also===
−
{{dcl list begin}}
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{{dsc begin}}
−
{{dcl list template | cpp/memory/new/dcl list operator_new}}
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{{dsc inc|cpp/memory/new/dsc operator_new}}
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{{dcl list template | cpp/memory/new/dcl list bad_alloc}}
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{{dsc inc|cpp/memory/new/dsc bad_alloc}}
−
{{dcl list end}}
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{{dsc end}}
 +
 
 +
{{langlinks|de|es|fr|it|ja|pt|ru|zh}}

Latest revision as of 00:29, 6 January 2024

 
C++
 
Utilities library
General utilities
Relational operators (deprecated in C++20)
 
Dynamic memory management
Uninitialized memory algorithms
Constrained uninitialized memory algorithms
Allocators
Garbage collection support
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)



 
Low level memory management
 
Defined in header <new>
class bad_array_new_length;
 (since C++11)

std::bad_array_new_length is the type of the object thrown as exceptions by the new-expressions to report invalid array lengths if

  1. Array length is negative,
  2. Total size of the new array would exceed implementation-defined maximum value,
  3. The number of initializer-clauses exceeds the number of elements to initialize.

Only the first array dimension may generate this exception; dimensions other than the first are constant expressions and are checked at compile time.

cpp/error/exceptioncpp/memory/new/bad allocstd-bad array new length-inheritance.svg

Inheritance diagram

Contents

[edit] Member functions

(constructor)
 constructs a new bad_array_new_length object
(public member function)
operator=
 replaces the bad_array_new_length object
(public member function)
what
 returns the explanatory string
(public member function)

std::bad_array_new_length::bad_array_new_length

bad_array_new_length() noexcept;
 (1) (since C++11)
bad_array_new_length( const bad_array_new_length& other ) noexcept;
 (2) (since C++11)

Constructs a new bad_array_new_length object with an implementation-defined null-terminated byte string which is accessible through what().

1) Default constructor.
2) Copy constructor. If *this and other both have dynamic type std::bad_array_new_length then std::strcmp(what(), other.what()) == 0.

Parameters

other - another exception object to copy

std::bad_array_new_length::operator=

bad_array_new_length& operator=( const bad_array_new_length& other ) noexcept;
 (since C++11)

Assigns the contents with those of other. If *this and other both have dynamic type std::bad_array_new_length then std::strcmp(what(), other.what()) == 0 after assignment.

Parameters

other - another exception object to assign with

Return value

*this

std::bad_array_new_length::what

virtual const char* what() const noexcept;
 (since C++11)

Returns the explanatory string.

Parameters

(none)

Return value

Pointer to a null-terminated string with explanatory information. The string is suitable for conversion and display as a std::wstring. 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 (e.g. copy assignment operator) on the exception object is called.

Notes

Implementations are allowed but not required to override what().

Inherited from std::bad_alloc

Inherited from std::exception

Member functions

[virtual]
 destroys the exception object
(virtual public member function of std::exception) [edit]
[virtual]
 returns an explanatory string
(virtual public member function of std::exception) [edit]

[edit] Example

Three conditions where std::bad_array_new_length should be thrown:

Run this code
#include <climits>
#include <iostream>
#include <new>
 
int main()
{
    try
    {
        int negative = -1;
        new int[negative];
    }
    catch (const std::bad_array_new_length& e)
    {
        std::cout << "1) " << e.what() << ": negative size\n";
    }
 
    try
    {
        int small = 1;
        new int[small]{1,2,3};
    }
    catch (const std::bad_array_new_length& e)
    {
        std::cout << "2) " << e.what() << ": too many initializers\n";
    }
 
    try
    {
        long large = LONG_MAX;
        new int[large][1000];
    } 
    catch (const std::bad_array_new_length& e)
    {
        std::cout << "3) " << e.what() << ": too large\n";
    }
 
    std::cout << "End\n";
}

Possible output: 

1) std::bad_array_new_length: negative size
2) std::bad_array_new_length: too many initializers
3) std::bad_array_new_length: too large
End

[edit] See also

 allocation functions
(function) [edit]
exception thrown when memory allocation fails
(class) [edit]
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