JsonNumber.h

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#ifndef ZYPP_CORE_PARSER_JSON_JSON_NUMBER_DEFINED
#define ZYPP_CORE_PARSER_JSON_JSON_NUMBER_DEFINED
 
#include <zypp-core/zyppng/pipelines/mtry.h>
#include <zypp-core/zyppng/pipelines/expected.h>
#include <string>
#include <cstdint>
 
namespace zypp::json {
 
  class Number {
 
  public:
    Number() = default;
    explicit Number( double v ) : _value(v) {}
    explicit Number( float v ) : _value(v) {}
    ~Number() = default;
 
    Number( const Number & ) = default;
    Number( Number && ) = default;
    Number &operator=(const Number &) = default;
    Number &operator=(Number &&) = default;
 
    static zyppng::expected<Number> fromString ( const std::string &str ) {
      using namespace zyppng::operators;
      using zyppng::operators::operator|;
      return zyppng::mtry([&](){ return std::stod( str, nullptr ); })
      | and_then([](double res) -> zyppng::expected<Number> { return zyppng::make_expected_success( Number(res)); } );
    }
 
    operator double() const {
      return _value;
    }
 
    double value() const {
      return _value;
    }

    std::string asJSON() const
    { return std::to_string (_value); }

    std::ostream & dumpOn( std::ostream & str ) const
    { return str << asJSON(); }
 
  private:
    double _value = 0;
 
  };

  inline std::ostream & operator<<( std::ostream & str, const Number & obj )
  {
    return obj.dumpOn( str );
  }
 
  class Int {
 
  public:
    Int() = default;
    Int( std::int64_t v ) : _value(v) {}
    ~Int() = default;
 
    Int( const Int & ) = default;
    Int( Int && ) = default;
    Int &operator=(const Int &) = default;
    Int &operator=(Int &&) = default;
 
    operator std::int64_t() const {
      return _value;
    }
 
    std::int64_t value() const {
      return _value;
    }
 
    static zyppng::expected<Int> fromString ( const std::string &str ) {
      using namespace zyppng::operators;
      using zyppng::operators::operator|;
      return zyppng::mtry([&](){ return std::stoll( str, nullptr ); })
      | and_then([](std::int64_t res) { return zyppng::make_expected_success( Int(res)); } );
    }

    std::string asJSON() const
    { return std::to_string (_value); }

    std::ostream & dumpOn( std::ostream & str ) const
    { return str << asJSON(); }
 
  private:
    std::int64_t _value = 0;
  };

  inline std::ostream & operator<<( std::ostream & str, const Int & obj )
  {
    return obj.dumpOn( str );
  }
 
  class UInt {
 
  public:
    UInt() = default;
    UInt( std::uint64_t v ) : _value(v) {}
    ~UInt() = default;
 
    UInt( const UInt & ) = default;
    UInt( UInt && ) = default;
    UInt &operator=(const UInt &) = default;
    UInt &operator=(UInt &&) = default;
 
    static zyppng::expected<UInt> fromString ( const std::string &str ){
      using namespace zyppng::operators;
      using zyppng::operators::operator|;
      return zyppng::mtry([&](){ return std::stoull( str, nullptr ); })
      | and_then([](unsigned long long res) { return zyppng::make_expected_success( UInt(res)); } );
    }
 
    operator std::uint64_t() const {
      return _value;
    }
 
    std::uint64_t value() const {
      return _value;
    }

    std::string asJSON() const
    { return std::to_string (_value); }

    std::ostream & dumpOn( std::ostream & str ) const
    { return str << asJSON(); }
 
  private:
    std::uint64_t _value = 0;
  };

  inline std::ostream & operator<<( std::ostream & str, const UInt & obj )
  {
    return obj.dumpOn( str );
  }
 
}
 
#endif