How to use an initializer_list to create a C++ of structures?

up vote
1
down vote

favorite

The following code works as expected to initialize a vector of structs:

#include <array>
struct node

 std::string name;
 std::string value;
;

const std::vector<node> reqFields (
 "query", tmpEmail ,
 "firstname", firstName ,
 "lastname", lastName 
);

I want to optimize my code a bit to use a C++ 11 array instead, given that my data is static. However, the following won't compile:

const std::array<node, 3>(
 "query", tmpEmail ,
 "firstname", firstName ,
 "lastname", lastName 
);

What is the right syntax to initialize the array? or maybe this is something that Visual Studio 15 has trouble with?

edited Nov 10 at 0:04

Shafik Yaghmour

123k23309511

asked Nov 9 at 23:56

ferchor2003

636

add a comment |

up vote
1
down vote

favorite

The following code works as expected to initialize a vector of structs:

#include <array>
struct node

 std::string name;
 std::string value;
;

const std::vector<node> reqFields (
 "query", tmpEmail ,
 "firstname", firstName ,
 "lastname", lastName 
);

I want to optimize my code a bit to use a C++ 11 array instead, given that my data is static. However, the following won't compile:

const std::array<node, 3>(
 "query", tmpEmail ,
 "firstname", firstName ,
 "lastname", lastName 
);

What is the right syntax to initialize the array? or maybe this is something that Visual Studio 15 has trouble with?

edited Nov 10 at 0:04

Shafik Yaghmour

123k23309511

asked Nov 9 at 23:56

ferchor2003

636

add a comment |

up vote
1
down vote

favorite

The following code works as expected to initialize a vector of structs:

#include <array>
struct node

 std::string name;
 std::string value;
;

const std::vector<node> reqFields (
 "query", tmpEmail ,
 "firstname", firstName ,
 "lastname", lastName 
);

I want to optimize my code a bit to use a C++ 11 array instead, given that my data is static. However, the following won't compile:

const std::array<node, 3>(
 "query", tmpEmail ,
 "firstname", firstName ,
 "lastname", lastName 
);

What is the right syntax to initialize the array? or maybe this is something that Visual Studio 15 has trouble with?

edited Nov 10 at 0:04

Shafik Yaghmour

123k23309511

asked Nov 9 at 23:56

ferchor2003

636

The following code works as expected to initialize a vector of structs:

#include <array>
struct node

 std::string name;
 std::string value;
;

const std::vector<node> reqFields (
 "query", tmpEmail ,
 "firstname", firstName ,
 "lastname", lastName 
);

I want to optimize my code a bit to use a C++ 11 array instead, given that my data is static. However, the following won't compile:

const std::array<node, 3>(
 "query", tmpEmail ,
 "firstname", firstName ,
 "lastname", lastName 
);

What is the right syntax to initialize the array? or maybe this is something that Visual Studio 15 has trouble with?

c++ c++11 visual-c++

edited Nov 10 at 0:04

Shafik Yaghmour

123k23309511

asked Nov 9 at 23:56

ferchor2003

636

edited Nov 10 at 0:04

Shafik Yaghmour

123k23309511

asked Nov 9 at 23:56

ferchor2003

636

edited Nov 10 at 0:04

Shafik Yaghmour

123k23309511

edited Nov 10 at 0:04

Shafik Yaghmour

123k23309511

edited Nov 10 at 0:04

Shafik Yaghmour

123k23309511

asked Nov 9 at 23:56

ferchor2003

636

asked Nov 9 at 23:56

ferchor2003

636

asked Nov 9 at 23:56

ferchor2003

636

add a comment |

1 Answer
1

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oldest

votes

up vote
2
down vote

accepted

std::vector has a constructor that takes initializer_list :

vector( std::initializer_list<T> init,
 const Allocator& alloc = Allocator() );

but std::array is an aggregate and follows the rules of aggregate initialization .

So you need to switch from () to

const std::array<node, 3> reqFields 
 "query", "tmp" ,
 "firstname", "firstName" ,
 "lastname", "lastName" 
;

see it live on godbolt.

edited Nov 10 at 13:36

answered Nov 10 at 0:00

Shafik Yaghmour

123k23309511

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
2
down vote

accepted

std::vector has a constructor that takes initializer_list :

vector( std::initializer_list<T> init,
 const Allocator& alloc = Allocator() );

but std::array is an aggregate and follows the rules of aggregate initialization .

So you need to switch from () to

const std::array<node, 3> reqFields 
 "query", "tmp" ,
 "firstname", "firstName" ,
 "lastname", "lastName" 
;

see it live on godbolt.

edited Nov 10 at 13:36

answered Nov 10 at 0:00

Shafik Yaghmour

123k23309511

add a comment |

up vote
2
down vote

accepted

std::vector has a constructor that takes initializer_list :

vector( std::initializer_list<T> init,
 const Allocator& alloc = Allocator() );

but std::array is an aggregate and follows the rules of aggregate initialization .

So you need to switch from () to

const std::array<node, 3> reqFields 
 "query", "tmp" ,
 "firstname", "firstName" ,
 "lastname", "lastName" 
;

see it live on godbolt.

edited Nov 10 at 13:36

answered Nov 10 at 0:00

Shafik Yaghmour

123k23309511

add a comment |

up vote
2
down vote

accepted

std::vector has a constructor that takes initializer_list :

vector( std::initializer_list<T> init,
 const Allocator& alloc = Allocator() );

but std::array is an aggregate and follows the rules of aggregate initialization .

So you need to switch from () to

const std::array<node, 3> reqFields 
 "query", "tmp" ,
 "firstname", "firstName" ,
 "lastname", "lastName" 
;

see it live on godbolt.

edited Nov 10 at 13:36

answered Nov 10 at 0:00

Shafik Yaghmour

123k23309511

std::vector has a constructor that takes initializer_list :

vector( std::initializer_list<T> init,
 const Allocator& alloc = Allocator() );

but std::array is an aggregate and follows the rules of aggregate initialization .

So you need to switch from () to

const std::array<node, 3> reqFields 
 "query", "tmp" ,
 "firstname", "firstName" ,
 "lastname", "lastName" 
;

see it live on godbolt.

edited Nov 10 at 13:36

answered Nov 10 at 0:00

Shafik Yaghmour

123k23309511

edited Nov 10 at 13:36

answered Nov 10 at 0:00

Shafik Yaghmour

123k23309511

answered Nov 10 at 0:00

Shafik Yaghmour

123k23309511

answered Nov 10 at 0:00

Shafik Yaghmour

123k23309511

add a comment |

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