How do I use std::initializer_list to initialize a struct?
So I've got a struct
struct live_set_item
{
uint32_t data_0;
uint64_t data_1;
uint64_t data_2;
live_set_item(uint32_t data_0_, uint32_t data_1_, uint64_t data_2_)
: data_0(data_0_), data_1(data_1_), data_2(data_2_)
{}
};
and I want to initialize with an initializer list like this
void foo()
{
struct live_set_item obj;
get_new_lsi(&obj);
if (failed_to_initialize(obj)) {
obj = {
.data_0 = 2000,
.data_1 = 2001,
.data_2 = 2002
};
}
}
But I keep getting this error from Clang
test.cpp:339:21: error: no viable overloaded '='
obj = {
~~~ ^ ~
test.cpp:175:16: note: candidate function (the implicit copy assignment operator) not
viable: cannot convert initializer list argument to 'const live_set_item'
struct live_set_item
^
So I found this question and tried that out
void operator=(const std::initializer_list<live_set_item>&) {}
But now it's telling me that the move assignment operator isn't valid? And my first argument is void?
test.cpp:175:16: note: candidate function (the implicit move assignment operator) not
viable: cannot convert initializer list argument to 'live_set_item'
test.cpp:204:22: note: candidate
function not viable: cannot convert argument of incomplete type 'void' to
'live_set_item' for 1st argument
void operator=(const std::initializer_list<au_live_set_item_v1>&) {}
^
This is where I'm lost, I've tried changing the assignment operator a couple different ways looking at the cpp docs for std::initializer list. Nothing is sticking. Could someone tell me what I'm doing wrong?
c++ c++11 constructor clang
asked Nov 13 '18 at 18:03
RipreadRipread
84
add a comment |
So I've got a struct
struct live_set_item
{
uint32_t data_0;
uint64_t data_1;
uint64_t data_2;
live_set_item(uint32_t data_0_, uint32_t data_1_, uint64_t data_2_)
: data_0(data_0_), data_1(data_1_), data_2(data_2_)
{}
};
and I want to initialize with an initializer list like this
void foo()
{
struct live_set_item obj;
get_new_lsi(&obj);
if (failed_to_initialize(obj)) {
obj = {
.data_0 = 2000,
.data_1 = 2001,
.data_2 = 2002
};
}
}
But I keep getting this error from Clang
test.cpp:339:21: error: no viable overloaded '='
obj = {
~~~ ^ ~
test.cpp:175:16: note: candidate function (the implicit copy assignment operator) not
viable: cannot convert initializer list argument to 'const live_set_item'
struct live_set_item
^
So I found this question and tried that out
void operator=(const std::initializer_list<live_set_item>&) {}
But now it's telling me that the move assignment operator isn't valid? And my first argument is void?
test.cpp:175:16: note: candidate function (the implicit move assignment operator) not
viable: cannot convert initializer list argument to 'live_set_item'
test.cpp:204:22: note: candidate
function not viable: cannot convert argument of incomplete type 'void' to
'live_set_item' for 1st argument
void operator=(const std::initializer_list<au_live_set_item_v1>&) {}
^
This is where I'm lost, I've tried changing the assignment operator a couple different ways looking at the cpp docs for std::initializer list. Nothing is sticking. Could someone tell me what I'm doing wrong?
c++ c++11 constructor clang
asked Nov 13 '18 at 18:03
RipreadRipread
84
Why do you need a constructor?
– Justin
Nov 13 '18 at 18:10
add a comment |
So I've got a struct
struct live_set_item
{
uint32_t data_0;
uint64_t data_1;
uint64_t data_2;
live_set_item(uint32_t data_0_, uint32_t data_1_, uint64_t data_2_)
: data_0(data_0_), data_1(data_1_), data_2(data_2_)
{}
};
and I want to initialize with an initializer list like this
void foo()
{
struct live_set_item obj;
get_new_lsi(&obj);
if (failed_to_initialize(obj)) {
obj = {
.data_0 = 2000,
.data_1 = 2001,
.data_2 = 2002
};
}
}
But I keep getting this error from Clang
test.cpp:339:21: error: no viable overloaded '='
obj = {
~~~ ^ ~
test.cpp:175:16: note: candidate function (the implicit copy assignment operator) not
viable: cannot convert initializer list argument to 'const live_set_item'
struct live_set_item
^
So I found this question and tried that out
void operator=(const std::initializer_list<live_set_item>&) {}
But now it's telling me that the move assignment operator isn't valid? And my first argument is void?
test.cpp:175:16: note: candidate function (the implicit move assignment operator) not
viable: cannot convert initializer list argument to 'live_set_item'
test.cpp:204:22: note: candidate
function not viable: cannot convert argument of incomplete type 'void' to
'live_set_item' for 1st argument
void operator=(const std::initializer_list<au_live_set_item_v1>&) {}
^
This is where I'm lost, I've tried changing the assignment operator a couple different ways looking at the cpp docs for std::initializer list. Nothing is sticking. Could someone tell me what I'm doing wrong?
c++ c++11 constructor clang
asked Nov 13 '18 at 18:03
RipreadRipread
84
So I've got a struct
struct live_set_item
{
uint32_t data_0;
uint64_t data_1;
uint64_t data_2;
live_set_item(uint32_t data_0_, uint32_t data_1_, uint64_t data_2_)
: data_0(data_0_), data_1(data_1_), data_2(data_2_)
{}
};
and I want to initialize with an initializer list like this
void foo()
{
struct live_set_item obj;
get_new_lsi(&obj);
if (failed_to_initialize(obj)) {
obj = {
.data_0 = 2000,
.data_1 = 2001,
.data_2 = 2002
};
}
}
But I keep getting this error from Clang
test.cpp:339:21: error: no viable overloaded '='
obj = {
~~~ ^ ~
test.cpp:175:16: note: candidate function (the implicit copy assignment operator) not
viable: cannot convert initializer list argument to 'const live_set_item'
struct live_set_item
^
So I found this question and tried that out
void operator=(const std::initializer_list<live_set_item>&) {}
But now it's telling me that the move assignment operator isn't valid? And my first argument is void?
test.cpp:175:16: note: candidate function (the implicit move assignment operator) not
viable: cannot convert initializer list argument to 'live_set_item'
test.cpp:204:22: note: candidate
function not viable: cannot convert argument of incomplete type 'void' to
'live_set_item' for 1st argument
void operator=(const std::initializer_list<au_live_set_item_v1>&) {}
^
This is where I'm lost, I've tried changing the assignment operator a couple different ways looking at the cpp docs for std::initializer list. Nothing is sticking. Could someone tell me what I'm doing wrong?
c++ c++11 constructor clang
c++ c++11 constructor clang
asked Nov 13 '18 at 18:03
RipreadRipread
84
asked Nov 13 '18 at 18:03
RipreadRipread
84
asked Nov 13 '18 at 18:03
RipreadRipread
84
asked Nov 13 '18 at 18:03
RipreadRipread
84
asked Nov 13 '18 at 18:03
RipreadRipread
84
84
Why do you need a constructor?
– Justin
Nov 13 '18 at 18:10
add a comment |
Why do you need a constructor?
– Justin
Nov 13 '18 at 18:10
Why do you need a constructor?
– Justin
Nov 13 '18 at 18:10
Why do you need a constructor?
– Justin
Nov 13 '18 at 18:10
add a comment |
1 Answer
1
active
oldest
votes
That's not an initializer_list you're trying to use there; it's a GCC designated initializer and you won't get it working in standard C++ no matter how hard you try.
Also, you're attempting an assignment, not an initialization (though copy assignment might be sufficient here if you get rid of the .data_0 = stuff).
answered Nov 13 '18 at 18:07
Lightness Races in OrbitLightness Races in Orbit
288k51470798
1
"you won't get it working in standard C++ no matter how hard you try" Designated initializers are coming in C++20.
– Justin
Nov 13 '18 at 18:10
@Justin Unlikely to work before that :P
– Lightness Races in Orbit
Nov 13 '18 at 18:29
add a comment |
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1 Answer
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active
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votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
That's not an initializer_list you're trying to use there; it's a GCC designated initializer and you won't get it working in standard C++ no matter how hard you try.
Also, you're attempting an assignment, not an initialization (though copy assignment might be sufficient here if you get rid of the .data_0 = stuff).
answered Nov 13 '18 at 18:07
Lightness Races in OrbitLightness Races in Orbit
288k51470798
1
"you won't get it working in standard C++ no matter how hard you try" Designated initializers are coming in C++20.
– Justin
Nov 13 '18 at 18:10
@Justin Unlikely to work before that :P
– Lightness Races in Orbit
Nov 13 '18 at 18:29
add a comment |
That's not an initializer_list you're trying to use there; it's a GCC designated initializer and you won't get it working in standard C++ no matter how hard you try.
Also, you're attempting an assignment, not an initialization (though copy assignment might be sufficient here if you get rid of the .data_0 = stuff).
answered Nov 13 '18 at 18:07
Lightness Races in OrbitLightness Races in Orbit
288k51470798
1
"you won't get it working in standard C++ no matter how hard you try" Designated initializers are coming in C++20.
– Justin
Nov 13 '18 at 18:10
@Justin Unlikely to work before that :P
– Lightness Races in Orbit
Nov 13 '18 at 18:29
add a comment |
That's not an initializer_list you're trying to use there; it's a GCC designated initializer and you won't get it working in standard C++ no matter how hard you try.
Also, you're attempting an assignment, not an initialization (though copy assignment might be sufficient here if you get rid of the .data_0 = stuff).
answered Nov 13 '18 at 18:07
Lightness Races in OrbitLightness Races in Orbit
288k51470798
That's not an initializer_list you're trying to use there; it's a GCC designated initializer and you won't get it working in standard C++ no matter how hard you try.
Also, you're attempting an assignment, not an initialization (though copy assignment might be sufficient here if you get rid of the .data_0 = stuff).
answered Nov 13 '18 at 18:07
Lightness Races in OrbitLightness Races in Orbit
288k51470798
answered Nov 13 '18 at 18:07
Lightness Races in OrbitLightness Races in Orbit
288k51470798
answered Nov 13 '18 at 18:07
Lightness Races in OrbitLightness Races in Orbit
288k51470798
answered Nov 13 '18 at 18:07
Lightness Races in OrbitLightness Races in Orbit
288k51470798
288k51470798
1
"you won't get it working in standard C++ no matter how hard you try" Designated initializers are coming in C++20.
– Justin
Nov 13 '18 at 18:10
@Justin Unlikely to work before that :P
– Lightness Races in Orbit
Nov 13 '18 at 18:29
add a comment |
1
"you won't get it working in standard C++ no matter how hard you try" Designated initializers are coming in C++20.
– Justin
Nov 13 '18 at 18:10
@Justin Unlikely to work before that :P
– Lightness Races in Orbit
Nov 13 '18 at 18:29
1
1
"you won't get it working in standard C++ no matter how hard you try" Designated initializers are coming in C++20.
– Justin
Nov 13 '18 at 18:10
"you won't get it working in standard C++ no matter how hard you try" Designated initializers are coming in C++20.
– Justin
Nov 13 '18 at 18:10
@Justin Unlikely to work before that :P
– Lightness Races in Orbit
Nov 13 '18 at 18:29
@Justin Unlikely to work before that :P
– Lightness Races in Orbit
Nov 13 '18 at 18:29
add a comment |
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Why do you need a constructor?
– Justin
Nov 13 '18 at 18:10