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Use drogon::OStringStream instead of std::stringstream in text templa…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| /** | ||
| * | ||
| * OStringStream.h | ||
| * An Tao | ||
| * | ||
| * Copyright 2018, An Tao. All rights reserved. | ||
| * https://github.com/an-tao/drogon | ||
| * Use of this source code is governed by a MIT license | ||
| * that can be found in the License file. | ||
| * | ||
| * Drogon | ||
| * | ||
| */ | ||
|
|
||
| #pragma once | ||
| #include <string> | ||
| #include <sstream> | ||
| #include <drogon/utils/string_view.h> | ||
|
|
||
| namespace drogon | ||
| { | ||
| namespace internal | ||
| { | ||
| template <typename T> | ||
| struct CanConvertToString | ||
| { | ||
| using Type = std::remove_reference_t<std::remove_cv_t<T>>; | ||
|
|
||
| private: | ||
| using yes = std::true_type; | ||
| using no = std::false_type; | ||
|
|
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| template <typename U> | ||
| static auto test(int) -> decltype(std::to_string(U{}), yes()); | ||
|
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| template <typename> | ||
| static no test(...); | ||
|
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| public: | ||
| static constexpr bool value = | ||
| std::is_same<decltype(test<Type>(0)), yes>::value; | ||
| }; | ||
| } // namespace internal | ||
| class OStringStream | ||
| { | ||
| public: | ||
| OStringStream() = default; | ||
| void reserve(size_t size) | ||
| { | ||
| buffer_.reserve(size); | ||
| } | ||
| template <typename T> | ||
| std::enable_if_t<!internal::CanConvertToString<T>::value, OStringStream&> | ||
| operator<<(T&& value) | ||
| { | ||
| std::stringstream ss; | ||
| ss << std::forward<T>(value); | ||
| buffer_.append(ss.str()); | ||
| return *this; | ||
| } | ||
| template <typename T> | ||
| std::enable_if_t<internal::CanConvertToString<T>::value, OStringStream&> | ||
| operator<<(T&& value) | ||
| { | ||
| buffer_.append(std::to_string(std::forward<T>(value))); | ||
| return *this; | ||
| } | ||
| template <int N> | ||
| OStringStream& operator<<(const char (&buf)[N]) | ||
| { | ||
| buffer_.append(buf, N - 1); | ||
| return *this; | ||
| } | ||
| OStringStream& operator<<(const string_view& str) | ||
| { | ||
| buffer_.append(str.data(), str.length()); | ||
| return *this; | ||
| } | ||
| OStringStream& operator<<(string_view&& str) | ||
| { | ||
| buffer_.append(str.data(), str.length()); | ||
| return *this; | ||
| } | ||
|
|
||
| OStringStream& operator<<(const std::string& str) | ||
| { | ||
| buffer_.append(str); | ||
| return *this; | ||
| } | ||
| OStringStream& operator<<(std::string&& str) | ||
| { | ||
| buffer_.append(std::move(str)); | ||
| return *this; | ||
| } | ||
|
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| OStringStream& operator<<(const double& d) | ||
| { | ||
| std::stringstream ss; | ||
| ss << d; | ||
| buffer_.append(ss.str()); | ||
| return *this; | ||
| } | ||
|
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| OStringStream& operator<<(const float& f) | ||
| { | ||
| std::stringstream ss; | ||
| ss << f; | ||
| buffer_.append(ss.str()); | ||
| return *this; | ||
| } | ||
|
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| OStringStream& operator<<(double&& d) | ||
| { | ||
| std::stringstream ss; | ||
| ss << d; | ||
| buffer_.append(ss.str()); | ||
| return *this; | ||
| } | ||
|
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| OStringStream& operator<<(float&& f) | ||
| { | ||
| std::stringstream ss; | ||
| ss << f; | ||
| buffer_.append(ss.str()); | ||
| return *this; | ||
| } | ||
|
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| std::string& str() | ||
| { | ||
| return buffer_; | ||
| } | ||
| const std::string& str() const | ||
| { | ||
| return buffer_; | ||
| } | ||
|
|
||
| private: | ||
| std::string buffer_; | ||
| }; | ||
| } // namespace drogon |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| #include <gtest/gtest.h> | ||
| #include <drogon/utils/OStringStream.h> | ||
| #include <string> | ||
| #include <iostream> | ||
|
|
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| TEST(OStringStreamTest, interger) | ||
| { | ||
| drogon::OStringStream ss; | ||
| ss << 12; | ||
| ss << 345L; | ||
| EXPECT_EQ(ss.str(), "12345"); | ||
| } | ||
|
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| TEST(OStringStreamTest, float_number) | ||
| { | ||
| drogon::OStringStream ss; | ||
| ss << 3.14f; | ||
| ss << 3.1416; | ||
| EXPECT_EQ(ss.str(), "3.143.1416"); | ||
| } | ||
|
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| TEST(OStringStreamTest, literal_string) | ||
| { | ||
| drogon::OStringStream ss; | ||
| ss << "hello"; | ||
| ss << " world"; | ||
| EXPECT_EQ(ss.str(), "hello world"); | ||
| } | ||
|
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| TEST(OStringStreamTest, string_view) | ||
| { | ||
| drogon::OStringStream ss; | ||
| ss << drogon::string_view("hello"); | ||
| ss << drogon::string_view(" world"); | ||
| EXPECT_EQ(ss.str(), "hello world"); | ||
| } | ||
|
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| TEST(OStringStreamTest, std_string) | ||
| { | ||
| drogon::OStringStream ss; | ||
| ss << std::string("hello"); | ||
| ss << std::string(" world"); | ||
| EXPECT_EQ(ss.str(), "hello world"); | ||
| } | ||
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| TEST(OStringStreamTest, mix) | ||
| { | ||
| drogon::OStringStream ss; | ||
| ss << std::string("hello"); | ||
| ss << drogon::string_view(" world"); | ||
| ss << "!"; | ||
| ss << 123; | ||
| ss << 3.14f; | ||
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| EXPECT_EQ(ss.str(), "hello world!1233.14"); | ||
| } | ||
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| int main(int argc, char **argv) | ||
| { | ||
| testing::InitGoogleTest(&argc, argv); | ||
| return RUN_ALL_TESTS(); | ||
| } |