Questions tagged [struct]
A keyword in various programming languages whose syntax is similar to or derived from C (C++, C#, Swift, Go, Rust, etc.). Use a specific programming language tag to tag questions involving use of a `struct` as syntax and semantics can be language dependent. Keyword defines or declares a data type composed of other data types. Each member of a struct has its own area of memory (as opposed to a `union` whose members share a single area of memory).
struct
30,643
questions
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Issue converting struct to parquet using xitongsys/parquet-go ( runtime error: invalid memory address or nil pointer dereference )
The timestamp in my struct is causing the following error:
runtime error: invalid memory address or nil pointer dereference
The struct is:
type MyTs struct {
time.Time
}
func (myts *MyTs) ...
- 75
1
vote
1
answer
132
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Can't understand this C syntax. Designated initialization of an array of structs?
Trying to learn the nuances of C, though I was doing well until I found this:
#define SOKOL_IMPL
#define SOKOL_GLES3
#include "sokol_gfx.h"
#include "sokol_log.h"
#include "...
0
votes
1
answer
69
views
C code for solving a 15-puzzle gives a segmentation fault when it tries to show the paths for each update to the puzzle
I have a code that is supposed to show the paths in solving a 15-puzzle after showing the initial state and goal state. However, while it does show the initial state and goal state, it gives a ...
-3
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0
answers
91
views
Why doesnt my program execute whenever i declare a struct? [closed]
I am working on the project euler problem 81: https://projecteuler.net/problem=81
I am trying to read a text file containing a matrix of numbers, load this into a two dimensional array, then declare a ...
1
vote
1
answer
105
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Why is it considered okay to use structs to represent MMIO registers in embedded system firmware, but not bit fields?
In embedded system firmware, it's common to represent multiple memory-mapped registers of a peripheral using a struct, under the assumption that compiler's code generation will follow a particular ...
- 3,317
0
votes
0
answers
27
views
Rust lifetimes in structs [duplicate]
Why is it not working?
struct Test<'s>(&'s mut i32);
impl<'n, 's: 'n> Test<'s> {
fn new(i: &'s mut i32) -> Self {
Self(i)
}
fn cast(&'s mut self) ...
- 73
1
vote
4
answers
121
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Using free on nested structs makes program crash
I was recently exploring ll the oop features of C, when i came to this issue. I want to create a game engine with C, so i use nested structs to organize ewerything. But when freeing the memory, the ...
0
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0
answers
21
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unpack requires a buffer of X bytes
field_names = []
for i in range(obj["fields_cnt"]):
print(i)
name_len = struct.unpack('H', f.read(2))[0]
print(type(name_len))
print(...
2
votes
2
answers
71
views
Struct loses value in UnitTest
I came across a strange behavior and would like some clarification what's happening here.
I did create a simple immutable struct
public readonly struct MatchingPair : IEquatable<MatchingPair>
{
...
- 305
-7
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0
answers
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How To Access An Item In A Struct Which Is In An Array [closed]
I am making a tower defense game and used structs in an array and want to access an item in the structs. I don't want to use a 2d array as that can't show up in a unity editor.
I tried tutorials and ...
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0
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STM32 HAL_TIM_PWM_PulseFinishedCallback not being called. Suspect that problem is related to use of struct or union pointers
I'm writing a Neopixel driver for STM32 based on the example provided here.
In summary, the pixels aren't lighting correctly. My latest attempt had the first row of 8 pixels light up green before it ...
-2
votes
1
answer
57
views
Binding/Pass-By-Reference for Array from Struct to Struct
I have one struct, struct DropletsView: View {} which has the following array: @State private var savedQuotes: [Quote] = [] (Quote is defined elsewhere, as a custom type for my app).
I would like to ...
- 162
0
votes
2
answers
69
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Go Pass Func to Struct like fields, Error "too few values in struct literal of type Test"
type Test struct {
a int
b int
}
func f(a, b int) (int, int) {
return a, b
}
k := Test{(f(5, 6))} // Error
but
type Test struct {
a int
}
func f(a int) int {
return a
}
k := ...
-3
votes
2
answers
58
views
How can i select one of declared structure and make alias? [closed]
enum class Color { RED, BLACK };
enum class TreeModel { AVL, RED_BACK, SPLAY }
struct BasicNode {
BasicNode* left;
BasicNode* right;
BasicNode* parent;
};
struct SplayNode : BasicNode {
...
- 1
0
votes
1
answer
55
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Invalid initializer error with anonymous structs
I have this code here:
Void() aba ()
{
}
#define std_Dynamic_Array(T) struct{Int32() count; Int32() capacity; T* memory; }
Void() no_body_func (Int32() b);
Int32() test_func (Int32()*** a)
{
}
Int32() ...
- 499