88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
/* This file is part of the Pangolin Project.
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* http://github.com/stevenlovegrove/Pangolin
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*
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* Copyright (c) 2014 Hauke Strasdat, Steven Lovegrove
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#pragma once
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#include <sstream>
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namespace pangolin {
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namespace details {
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// Following: http://stackoverflow.com/a/22759544
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template <typename T>
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class IsStreamable {
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private:
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template <typename TT>
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static auto test(int) -> decltype( (std::declval<std::stringstream&>() << std::declval<TT>(), std::true_type()) );
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template <typename>
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static auto test(...) -> std::false_type;
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public:
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static const bool value = decltype(test<T>(0))::value;
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};
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inline void FormatStream(std::stringstream& stream, const char* text)
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{
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stream << text;
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}
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// Following: http://en.cppreference.com/w/cpp/language/parameter_pack
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template <typename T, typename... Args>
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void FormatStream(std::stringstream& stream, const char* text, T arg, Args... args)
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{
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static_assert(IsStreamable<T>::value,
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"One of the args has not an ostream overload!");
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for (; *text != '\0'; ++text) {
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if (*text == '%') {
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stream << arg;
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FormatStream(stream, text + 1, args...);
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return;
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}
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stream << *text;
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}
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stream << "\nFormat-Warning: There are " << sizeof...(Args) + 1
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<< " args unused.";
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}
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} // namespace details
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template <typename... Args>
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std::string FormatString(const char* text, Args... args)
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{
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std::stringstream stream;
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details::FormatStream(stream, text, args...);
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return stream.str();
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}
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inline std::string FormatString()
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{
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return std::string();
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}
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}
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