我编写 Cargo.toml 的依赖项:
\n\n[dependencies ]\nopencv = {version = "0.26", default-features = false, features = ["opencv-41"]}\nRun Code Online (Sandbox Code Playgroud)\n\n以上一行即可编译通过。
\n\n我想分隔依赖关系的行。
\n\n此页面\n https://github.com/BurntSushi/toml-test/blob/master/tests/valid/multiline-string.toml
\n\n说解决方案。
\n\n我参考这个解决方案来编写我的依赖项:
\n\n[dependencies ]\nopencv = """\\{version = "0.26", \\\ndefault-features = false, \\\nfeatures = ["opencv-41"] \\\n}"""\nRun Code Online (Sandbox Code Playgroud)\n\n但编译器抛出错误:
\n\n$ cargo build [\xc2\xb1master \xe2\x97\x8f]\n\nerror: failed to parse manifest at /home/curlywei/WorkSpace/rust/testcargo/Cargo.toml\n\nCaused by:\n failed to parse the version requirement { version = "0.26", default-features = false, features = ["opencv-41"] } for dependency opencv\n\nCaused by:\n the given version …Run Code Online (Sandbox Code Playgroud) 最近读了std::mov的C++,想到一个问题作为标题。
假设初始值如下:
int a= 1;
int b= 2;
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我认为:
情况一、
移动后(a <- b):
a= 2 , b=
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b 为空,因为已移动
情况2,
复制后(a <- b):
a=2 , b=2
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我知道C++的std::move是情况1
汇编语言的情况是mov(mov %b %a) 。?
这是我的问题。
对于这种情况:
int arr[] = {0, 1, 2};
void func (int* arr_in){
int offset_0 = 0;
int offset_1 = 1;
int offset_2 = 2;
printf("%d\n", *(arr_in + offset_0) );
printf("%d\n", *(arr_in + offset_1) );
printf("%d\n", *(arr_in + offset_2) );
}
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编译器不会抱怨我使用的是int还是unsigned.
两个结果似乎也正确。
int arr[] = {0, 1, 2};
void func (int* arr_in){
int offset_0 = 0;
int offset_1 = 1;
int offset_2 = 2;
printf("%d\n", *(arr_in + offset_0) );
printf("%d\n", *(arr_in + offset_1) );
printf("%d\n", *(arr_in + …Run Code Online (Sandbox Code Playgroud) I coding for "pass dynamic 2D to function" with C.
The following code compiles successfully and runs fine.
void iter_2d(const int** arr,
const size_t row,
const size_t column) {
// ..some code
}
int main(){
const size_t column = 3, row = 4;
int** arr = (int**)malloc(sizeof(int*) * row);
for (size_t i = 0; i < row; i++)
arr[i] = (int*)malloc(sizeof(int) * column);
// init val for array
iter_2d(arr,row,column);
// clear array
}
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but I get warning:
t.c:24:11: warning: passing …Run Code Online (Sandbox Code Playgroud)