diff options
| -rw-r--r-- | doc/manual.md | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/doc/manual.md b/doc/manual.md index cb2509bd2..93f13f818 100644 --- a/doc/manual.md +++ b/doc/manual.md @@ -8072,8 +8072,8 @@ CodegenDecl pragma ------------------ The `codegenDecl` pragma can be used to directly influence Nim's code -generator. It receives a format string that determines how the variable -or proc is declared in the generated code. +generator. It receives a format string that determines how the variable, +proc or object type is declared in the generated code. For variables, $1 in the format string represents the type of the variable, $2 is the name of the variable, and each appearance of $# represents $1/$2 @@ -8108,7 +8108,30 @@ will generate this code: ```c __interrupt void myinterrupt() ``` + +For object types, the $1 represents the name of the object type, $2 is the list of +fields and $3 is the base type. +```nim + +const strTemplate = """ + struct $1 { + $2 + }; +""" +type Foo {.codegenDecl:strTemplate.} = object + a, b: int +``` + +will generate this code: + + +```c +struct Foo { + NI a; + NI b; +}; +``` `cppNonPod` pragma ------------------ |