73 lines
1.8 KiB
C++
73 lines
1.8 KiB
C++
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/// @file
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/// FormatString functionality
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#ifndef SOPHUS_FORMATSTRING_HPP
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#define SOPHUS_FORMATSTRING_HPP
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#include <iostream>
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namespace Sophus {
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namespace details {
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// Following: http://stackoverflow.com/a/22759544
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template <class T>
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class IsStreamable {
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private:
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template <class TT>
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static auto test(int)
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-> decltype(std::declval<std::stringstream&>() << std::declval<TT>(),
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std::true_type());
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template <class>
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static auto test(...) -> std::false_type;
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public:
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static bool const value = decltype(test<T>(0))::value;
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};
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template <class T>
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class ArgToStream {
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public:
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static void impl(std::stringstream& stream, T&& arg) {
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stream << std::forward<T>(arg);
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}
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};
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inline void FormatStream(std::stringstream& stream, char const* text) {
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stream << text;
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return;
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}
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// Following: http://en.cppreference.com/w/cpp/language/parameter_pack
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template <class T, typename... Args>
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void FormatStream(std::stringstream& stream, char const* text, T&& arg,
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Args&&... args) {
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static_assert(IsStreamable<T>::value,
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"One of the args has no ostream overload!");
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for (; *text != '\0'; ++text) {
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if (*text == '%') {
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ArgToStream<T&&>::impl(stream, std::forward<T>(arg));
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FormatStream(stream, text + 1, std::forward<Args>(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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return;
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}
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template <class... Args>
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std::string FormatString(char const* text, Args&&... args) {
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std::stringstream stream;
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FormatStream(stream, text, std::forward<Args>(args)...);
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return stream.str();
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}
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inline std::string FormatString() { return std::string(); }
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} // namespace details
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} // namespace Sophus
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#endif //SOPHUS_FORMATSTRING_HPP
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