Add a helper function to make calling predicate methods from c easy.

diff --git a/cmop/mop.c b/cmop/mop.c
index 126568d..b921879 100644 (file)
--- a/cmop/mop.c
+++ b/cmop/mop.c
@@ -75,6 +75,39 @@ mop_call0 (pTHX_ SV *const self, SV *const method)
     return ret;
 }
 
+bool
+mop_call_predicate (SV *self, const char *method)
+{
+    dSP;
+    I32 count;
+    SV *sv;
+    bool ret;
+
+    ENTER;
+    SAVETMPS;
+
+    PUSHMARK (SP);
+    XPUSHs (self);
+    PUTBACK;
+
+    count = call_method (method, G_SCALAR);
+
+    if (count != 1) {
+        croak ("predicate method %s didn't return exactly one value", method);
+    }
+
+    SPAGAIN;
+
+    sv = POPs;
+    ret = SvTRUE (sv);
+
+    PUTBACK;
+    FREETMPS;
+    LEAVE;
+
+    return ret;
+}
+
 int
 mop_get_code_info (SV *coderef, char **pkg, char **name)
 {

diff --git a/include/mop.h b/include/mop.h
index 7566652..f6ea76f 100644 (file)
--- a/include/mop.h
+++ b/include/mop.h
@@ -49,6 +49,7 @@ extern SV *mop_wrap;
 UV mop_check_package_cache_flag(pTHX_ HV *stash);
 int mop_get_code_info (SV *coderef, char **pkg, char **name);
 SV *mop_call0(pTHX_ SV *const self, SV *const method);
+bool mop_call_predicate (SV *self, const char *method);
 
 typedef enum {
     TYPE_FILTER_NONE,