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D extend CTFE at compile time

2022-07-22 10:23:00 【fqbqrr】

//main.d
import std;

void main()
{
    
    enum x = iota(1, 5).reduce!"a * b";
    x.writeln();
}

Through something like :

dmd --expand-ctfe main.d -o expanded.d
cat expanded.d

obtain :

//expanded.d
import std;

void main()
{
    
    24.writeln();
}

Try -vcg-ast sign :

import object;
import std;
void main()
{
    
    enum int x = 24;
    writeln(24);
    return 0;
}

//  A pile of template instances

Or so :

template printEnum(alias x, string file = __FILE__, size_t line = __LINE__)
{
    
   enum printEnum = x;
   pragma(msg, file, "(", int(line), "): ", printEnum);// Print .
}
enum x = printEnum!(iota(1, 5).reduce!"a * b");

But this is it :

debug template printEnum(...) {
    
  ... //  The above content is only used for debugging .
}// add -debug sign .
else
enum printEnum(alias x) = x;

Reference resources
Large memory , use 64 position compile :

dmd -m64 -run test.d

原网站

版权声明
本文为[fqbqrr]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/203/202207211853132471.html

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D extend CTFE at compile time

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