add explicit conversion to NoNeedBufferVarsFunctor, test=develop (#21430)

6b09b73e · Zeng Jinle · GitHub · ac854670 · 6b09b73e
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paddle/fluid/framework/no_need_buffer_vars_inference.h paddle/fluid/framework/no_need_buffer_vars_inference.h +1 -1

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--- a/paddle/fluid/framework/no_need_buffer_vars_inference.h
+++ b/paddle/fluid/framework/no_need_buffer_vars_inference.h
@@ -114,7 +114,7 @@ class InferNoNeedBufferVarsFN {
    return (*inferer_)(ctx);
  }

-  inline operator bool() const { return inferer_ != nullptr; }
+  inline explicit operator bool() const { return inferer_ != nullptr; }

  inline bool operator!() const { return inferer_ == nullptr; }