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64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
#pragma once
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#include <sstream>
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#include <string>
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class DebugPrintVisitor
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{
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public:
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DebugPrintVisitor(std::string const & name) : m_name(name) {}
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template <typename T>
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void operator()(T const & t, char const * name = nullptr)
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{
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if (!m_empty)
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m_os << ", ";
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m_empty = false;
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if (name)
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m_os << name << ": ";
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m_os << DebugPrint(t);
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}
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// This override is implemented to support deserialization with optional values
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// which could be declared by DECLARE_VISITOR_AND_DEBUG_PRINT macro.
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// Because of this class is used just for serialize structures into strings,
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// the second parameter is used for method signature compatibility only.
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template <typename T>
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void operator()(T const & t, T const &, char const * name = nullptr)
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{
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operator()(t, name);
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}
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std::string ToString() const { return m_name + " [" + m_os.str() + "]"; }
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private:
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std::string m_name;
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bool m_empty = true;
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std::ostringstream m_os;
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};
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#define DECLARE_VISITOR(...) \
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template <typename Visitor> \
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void Visit(Visitor & visitor) \
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{ \
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__VA_ARGS__; \
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} \
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template <typename Visitor> \
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void Visit(Visitor & visitor) const \
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{ \
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__VA_ARGS__; \
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}
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#define DECLARE_DEBUG_PRINT(className) \
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friend std::string DebugPrint(className const & c) \
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{ \
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DebugPrintVisitor visitor(#className); \
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c.Visit(visitor); \
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return visitor.ToString(); \
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}
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#define DECLARE_VISITOR_AND_DEBUG_PRINT(className, ...) \
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DECLARE_VISITOR(__VA_ARGS__) \
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DECLARE_DEBUG_PRINT(className)
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