how to initialize dynamic object array
what if i create array of objects dynamically , then how to initialize instance data members . Because at the time of using new keyword only array dimension can be mentioned not the arguments for constructor.
c++ arrays constructor new-operator
asked Nov 21 '18 at 16:12
YUVRAJ SINGHYUVRAJ SINGH
1
add a comment |
what if i create array of objects dynamically , then how to initialize instance data members . Because at the time of using new keyword only array dimension can be mentioned not the arguments for constructor.
c++ arrays constructor new-operator
asked Nov 21 '18 at 16:12
YUVRAJ SINGHYUVRAJ SINGH
1
7
Usestd::vectorand spare your sanity.
– NathanOliver
Nov 21 '18 at 16:14
add a comment |
what if i create array of objects dynamically , then how to initialize instance data members . Because at the time of using new keyword only array dimension can be mentioned not the arguments for constructor.
c++ arrays constructor new-operator
asked Nov 21 '18 at 16:12
YUVRAJ SINGHYUVRAJ SINGH
1
what if i create array of objects dynamically , then how to initialize instance data members . Because at the time of using new keyword only array dimension can be mentioned not the arguments for constructor.
c++ arrays constructor new-operator
c++ arrays constructor new-operator
asked Nov 21 '18 at 16:12
YUVRAJ SINGHYUVRAJ SINGH
1
asked Nov 21 '18 at 16:12
YUVRAJ SINGHYUVRAJ SINGH
1
asked Nov 21 '18 at 16:12
YUVRAJ SINGHYUVRAJ SINGH
1
asked Nov 21 '18 at 16:12
YUVRAJ SINGHYUVRAJ SINGH
1
asked Nov 21 '18 at 16:12
YUVRAJ SINGHYUVRAJ SINGH
1
1
7
Usestd::vectorand spare your sanity.
– NathanOliver
Nov 21 '18 at 16:14
add a comment |
7
Usestd::vectorand spare your sanity.
– NathanOliver
Nov 21 '18 at 16:14
7
7
Use
std::vector and spare your sanity.– NathanOliver
Nov 21 '18 at 16:14
Use
std::vector and spare your sanity.– NathanOliver
Nov 21 '18 at 16:14
add a comment |
1 Answer
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Because at the time of using new keyword only array dimension can be mentioned not the arguments for constructor.
The canonical way in the c++ language is to use std::vector:
std::vector<int> array(10, 42);
// ^ ^
// | | the value
// | the size
Another way to initialize the std::vector with different values is to use a std::initializer_list like so:
std::vector<int> array = { 1, 2 , 3, 4, 5, 6 , 55, 0, -2, 42, -16 };
Note:
In c++ you should use new and delete only for very rare cases in your own code. These are really advanced and you have to be 100% sure that your use case really demands to do that.
Manual memory management is usually not necessary at all, and the c++ standard library provides
- a very broad collection of Container classes
- a number of Smart pointer classes
which relieve you from all of the pitfalls of manual dynamic memory management.
Just use that stuff, anyone who demands you to do something else is most probably incompetent, or was fooled by myths telling that using the stuff from the standard library would imply a significant performance impact.
answered Nov 21 '18 at 18:06
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1 Answer
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Because at the time of using new keyword only array dimension can be mentioned not the arguments for constructor.
The canonical way in the c++ language is to use std::vector:
std::vector<int> array(10, 42);
// ^ ^
// | | the value
// | the size
Another way to initialize the std::vector with different values is to use a std::initializer_list like so:
std::vector<int> array = { 1, 2 , 3, 4, 5, 6 , 55, 0, -2, 42, -16 };
Note:
In c++ you should use new and delete only for very rare cases in your own code. These are really advanced and you have to be 100% sure that your use case really demands to do that.
Manual memory management is usually not necessary at all, and the c++ standard library provides
- a very broad collection of Container classes
- a number of Smart pointer classes
which relieve you from all of the pitfalls of manual dynamic memory management.
Just use that stuff, anyone who demands you to do something else is most probably incompetent, or was fooled by myths telling that using the stuff from the standard library would imply a significant performance impact.
answered Nov 21 '18 at 18:06
πάντα ῥεῖπάντα ῥεῖ
72.3k974137
add a comment |
Because at the time of using new keyword only array dimension can be mentioned not the arguments for constructor.
The canonical way in the c++ language is to use std::vector:
std::vector<int> array(10, 42);
// ^ ^
// | | the value
// | the size
Another way to initialize the std::vector with different values is to use a std::initializer_list like so:
std::vector<int> array = { 1, 2 , 3, 4, 5, 6 , 55, 0, -2, 42, -16 };
Note:
In c++ you should use new and delete only for very rare cases in your own code. These are really advanced and you have to be 100% sure that your use case really demands to do that.
Manual memory management is usually not necessary at all, and the c++ standard library provides
- a very broad collection of Container classes
- a number of Smart pointer classes
which relieve you from all of the pitfalls of manual dynamic memory management.
Just use that stuff, anyone who demands you to do something else is most probably incompetent, or was fooled by myths telling that using the stuff from the standard library would imply a significant performance impact.
answered Nov 21 '18 at 18:06
πάντα ῥεῖπάντα ῥεῖ
72.3k974137
add a comment |
Because at the time of using new keyword only array dimension can be mentioned not the arguments for constructor.
The canonical way in the c++ language is to use std::vector:
std::vector<int> array(10, 42);
// ^ ^
// | | the value
// | the size
Another way to initialize the std::vector with different values is to use a std::initializer_list like so:
std::vector<int> array = { 1, 2 , 3, 4, 5, 6 , 55, 0, -2, 42, -16 };
Note:
In c++ you should use new and delete only for very rare cases in your own code. These are really advanced and you have to be 100% sure that your use case really demands to do that.
Manual memory management is usually not necessary at all, and the c++ standard library provides
- a very broad collection of Container classes
- a number of Smart pointer classes
which relieve you from all of the pitfalls of manual dynamic memory management.
Just use that stuff, anyone who demands you to do something else is most probably incompetent, or was fooled by myths telling that using the stuff from the standard library would imply a significant performance impact.
answered Nov 21 '18 at 18:06
πάντα ῥεῖπάντα ῥεῖ
72.3k974137
Because at the time of using new keyword only array dimension can be mentioned not the arguments for constructor.
The canonical way in the c++ language is to use std::vector:
std::vector<int> array(10, 42);
// ^ ^
// | | the value
// | the size
Another way to initialize the std::vector with different values is to use a std::initializer_list like so:
std::vector<int> array = { 1, 2 , 3, 4, 5, 6 , 55, 0, -2, 42, -16 };
Note:
In c++ you should use new and delete only for very rare cases in your own code. These are really advanced and you have to be 100% sure that your use case really demands to do that.
Manual memory management is usually not necessary at all, and the c++ standard library provides
- a very broad collection of Container classes
- a number of Smart pointer classes
which relieve you from all of the pitfalls of manual dynamic memory management.
Just use that stuff, anyone who demands you to do something else is most probably incompetent, or was fooled by myths telling that using the stuff from the standard library would imply a significant performance impact.
answered Nov 21 '18 at 18:06
πάντα ῥεῖπάντα ῥεῖ
72.3k974137
edited Nov 21 '18 at 18:23
answered Nov 21 '18 at 18:06
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answered Nov 21 '18 at 18:06
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answered Nov 21 '18 at 18:06
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7
Use
std::vectorand spare your sanity.– NathanOliver
Nov 21 '18 at 16:14