to_string.hpp

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/*
 Copyright (C) 2016 Quaternion Risk Management Ltd
 All rights reserved.
 
 This file is part of ORE, a free-software/open-source library
 for transparent pricing and risk analysis - http://opensourcerisk.org
 
 ORE is free software: you can redistribute it and/or modify it
 under the terms of the Modified BSD License.  You should have received a
 copy of the license along with this program.
 The license is also available online at <http://opensourcerisk.org>
 
 This program is distributed on the basis that it will form a useful
 contribution to risk analytics and model standardisation, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 FITNESS FOR A PARTICULAR PURPOSE. See the license for more details.
*/
 
/*! \file ored/utilities/to_string.hpp
    \brief string conversion utilities
    \ingroup utilities
*/
 
#pragma once
 
#include <ql/time/date.hpp>
#include <ql/time/period.hpp>
 
#include <set>
#include <sstream>
 
namespace ore {
namespace data {
 
//! Convert QuantLib::Date to std::string
/*!
  Returns date as a string in YYYY-MM-DD format, which matches QuantLib::io::iso_date()
  However that function can have issues with locale so we have a local snprintf() based version.
 
  If date == Date() returns 1900-01-01 so the above format is preserved.
 
  \ingroup utilities
*/
std::string to_string(const QuantLib::Date& date);
 
//! Convert bool to std::string
/*! Returns "true" for true and "false" for false
    \ingroup utilities
*/
std::string to_string(bool aBool);
 
//! Convert QuantLib::Period to std::string
/*!
  Returns Period as a string as up to QuantLib 1.25, e.g. 13M is written as 1Y1M etc.
 
  \ingroup utilities
*/
std::string to_string(const QuantLib::Period& period);
 
//! Convert vector to std::string
/*!
  Returns a vector into a single string, with elemenst separated by Period as a string as up to QuantLib 1.25, e.g. 13M is written as 1Y1M etc.
 
  \ingroup utilities
*/
template <class T>  std::string to_string(const std::vector<T>& vec, const std::string& sep = ",") {
    std::ostringstream oss;
    for (std::size_t i = 0; i < vec.size(); ++i) {
        oss << vec[i];
        if (i < vec.size() - 1)
            oss << sep;
    }
    return oss.str();    
}
 
//! Convert set to std::string
/*!
  \ingroup utilities
*/
template <class T>  std::string to_string(const std::set<T>& set, const std::string& sep = ",") {
    std::ostringstream oss;
    std::size_t count = 1;
    for (auto s: set) {
        oss << s;
        if (count < set.size())
            oss << sep;
        count++;
    }
    return oss.str();    
}
 
//! Convert type to std::string
/*!
  Utility to give to_string() interface to classes and enums that have ostream<< operators defined.
  \ingroup utilities
*/
template <class T> std::string to_string(const T& t) {
    std::ostringstream oss;
    oss << t;
    return oss.str();
}
} // namespace data
} // namespace ore