diff --git a/README.md b/README.md
index 1d065407..8c6eca8f 100644
--- a/README.md
+++ b/README.md
@@ -975,6 +975,7 @@ I deeply appreciate the help of the following people.
- [Paul Fultz II](https://github.com/pfultz2) added a note on the cget package manager.
- [Wilson Lin](https://github.com/wla80) made the integration section of the README more concise.
- [RalfBielig](https://github.com/ralfbielig) detected and fixed a memory leak in the parser callback.
+- [agrianius](https://github.com/agrianius) allowed to dump JSON to an alternative string type
Thanks a lot for helping out! Please [let me know](mailto:mail@nlohmann.me) if I forgot someone.
diff --git a/include/nlohmann/detail/input/lexer.hpp b/include/nlohmann/detail/input/lexer.hpp
index ea116093..98cc1b69 100644
--- a/include/nlohmann/detail/input/lexer.hpp
+++ b/include/nlohmann/detail/input/lexer.hpp
@@ -32,6 +32,7 @@ class lexer
using number_integer_t = typename BasicJsonType::number_integer_t;
using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
using number_float_t = typename BasicJsonType::number_float_t;
+ using string_t = typename BasicJsonType::string_t;
public:
/// token types for the parser
@@ -1130,7 +1131,7 @@ scan_number_done:
}
/// return current string value (implicitly resets the token; useful only once)
- std::string&& move_string()
+ string_t&& move_string()
{
return std::move(token_buffer);
}
@@ -1260,7 +1261,7 @@ scan_number_done:
std::vector<char> token_string {};
/// buffer for variable-length tokens (numbers, strings)
- std::string token_buffer {};
+ string_t token_buffer {};
/// a description of occurred lexer errors
const char* error_message = "";
diff --git a/include/nlohmann/detail/input/parser.hpp b/include/nlohmann/detail/input/parser.hpp
index 847538d6..5559692d 100644
--- a/include/nlohmann/detail/input/parser.hpp
+++ b/include/nlohmann/detail/input/parser.hpp
@@ -33,6 +33,7 @@ class parser
using number_integer_t = typename BasicJsonType::number_integer_t;
using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
using number_float_t = typename BasicJsonType::number_float_t;
+ using string_t = typename BasicJsonType::string_t;
using lexer_t = lexer<BasicJsonType>;
using token_type = typename lexer_t::token_type;
@@ -205,7 +206,7 @@ class parser
}
// parse values
- std::string key;
+ string_t key;
BasicJsonType value;
while (true)
{
diff --git a/include/nlohmann/detail/output/output_adapters.hpp b/include/nlohmann/detail/output/output_adapters.hpp
index fe9e1b36..ff86a6e1 100644
--- a/include/nlohmann/detail/output/output_adapters.hpp
+++ b/include/nlohmann/detail/output/output_adapters.hpp
@@ -68,11 +68,11 @@ class output_stream_adapter : public output_adapter_protocol<CharType>
};
/// output adapter for basic_string
-template<typename CharType>
+template<typename CharType, typename StringType = std::basic_string<CharType>>
class output_string_adapter : public output_adapter_protocol<CharType>
{
public:
- explicit output_string_adapter(std::basic_string<CharType>& s) : str(s) {}
+ explicit output_string_adapter(StringType& s) : str(s) {}
void write_character(CharType c) override
{
@@ -85,10 +85,10 @@ class output_string_adapter : public output_adapter_protocol<CharType>
}
private:
- std::basic_string<CharType>& str;
+ StringType& str;
};
-template<typename CharType>
+template<typename CharType, typename StringType = std::basic_string<CharType>>
class output_adapter
{
public:
@@ -98,8 +98,8 @@ class output_adapter
output_adapter(std::basic_ostream<CharType>& s)
: oa(std::make_shared<output_stream_adapter<CharType>>(s)) {}
- output_adapter(std::basic_string<CharType>& s)
- : oa(std::make_shared<output_string_adapter<CharType>>(s)) {}
+ output_adapter(StringType& s)
+ : oa(std::make_shared<output_string_adapter<CharType, StringType>>(s)) {}
operator output_adapter_t<CharType>()
{
diff --git a/include/nlohmann/json.hpp b/include/nlohmann/json.hpp
index 5a5f1cfe..609b8d96 100644
--- a/include/nlohmann/json.hpp
+++ b/include/nlohmann/json.hpp
@@ -1950,7 +1950,7 @@ class basic_json
const bool ensure_ascii = false) const
{
string_t result;
- serializer s(detail::output_adapter<char>(result), indent_char);
+ serializer s(detail::output_adapter<char, string_t>(result), indent_char);
if (indent >= 0)
{
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 73f9ee6c..7a35db73 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -1871,6 +1871,7 @@ class lexer
using number_integer_t = typename BasicJsonType::number_integer_t;
using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
using number_float_t = typename BasicJsonType::number_float_t;
+ using string_t = typename BasicJsonType::string_t;
public:
/// token types for the parser
@@ -2969,7 +2970,7 @@ scan_number_done:
}
/// return current string value (implicitly resets the token; useful only once)
- std::string&& move_string()
+ string_t&& move_string()
{
return std::move(token_buffer);
}
@@ -3099,7 +3100,7 @@ scan_number_done:
std::vector<char> token_string {};
/// buffer for variable-length tokens (numbers, strings)
- std::string token_buffer {};
+ string_t token_buffer {};
/// a description of occurred lexer errors
const char* error_message = "";
@@ -3538,6 +3539,7 @@ class parser
using number_integer_t = typename BasicJsonType::number_integer_t;
using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
using number_float_t = typename BasicJsonType::number_float_t;
+ using string_t = typename BasicJsonType::string_t;
using lexer_t = lexer<BasicJsonType>;
using token_type = typename lexer_t::token_type;
@@ -3710,7 +3712,7 @@ class parser
}
// parse values
- std::string key;
+ string_t key;
BasicJsonType value;
while (true)
{
@@ -5250,11 +5252,11 @@ class output_stream_adapter : public output_adapter_protocol<CharType>
};
/// output adapter for basic_string
-template<typename CharType>
+template<typename CharType, typename StringType = std::basic_string<CharType>>
class output_string_adapter : public output_adapter_protocol<CharType>
{
public:
- explicit output_string_adapter(std::basic_string<CharType>& s) : str(s) {}
+ explicit output_string_adapter(StringType& s) : str(s) {}
void write_character(CharType c) override
{
@@ -5267,10 +5269,10 @@ class output_string_adapter : public output_adapter_protocol<CharType>
}
private:
- std::basic_string<CharType>& str;
+ StringType& str;
};
-template<typename CharType>
+template<typename CharType, typename StringType = std::basic_string<CharType>>
class output_adapter
{
public:
@@ -5280,8 +5282,8 @@ class output_adapter
output_adapter(std::basic_ostream<CharType>& s)
: oa(std::make_shared<output_stream_adapter<CharType>>(s)) {}
- output_adapter(std::basic_string<CharType>& s)
- : oa(std::make_shared<output_string_adapter<CharType>>(s)) {}
+ output_adapter(StringType& s)
+ : oa(std::make_shared<output_string_adapter<CharType, StringType>>(s)) {}
operator output_adapter_t<CharType>()
{
@@ -12060,7 +12062,7 @@ class basic_json
const bool ensure_ascii = false) const
{
string_t result;
- serializer s(detail::output_adapter<char>(result), indent_char);
+ serializer s(detail::output_adapter<char, string_t>(result), indent_char);
if (indent >= 0)
{
diff --git a/test/Makefile b/test/Makefile
index 51edae66..f373451f 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -9,6 +9,7 @@ CPPFLAGS += -I ../single_include -I . -I thirdparty/catch -I thirdparty/fifo_map
SOURCES = src/unit.cpp \
src/unit-algorithms.cpp \
src/unit-allocator.cpp \
+ src/unit-alt-string.cpp \
src/unit-capacity.cpp \
src/unit-cbor.cpp \
src/unit-class_const_iterator.cpp \
diff --git a/test/src/unit-alt-string.cpp b/test/src/unit-alt-string.cpp
new file mode 100644
index 00000000..30159fc3
--- /dev/null
+++ b/test/src/unit-alt-string.cpp
@@ -0,0 +1,212 @@
+/*
+ __ _____ _____ _____
+ __| | __| | | | JSON for Modern C++ (test suite)
+| | |__ | | | | | | version 3.1.1
+|_____|_____|_____|_|___| https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+Copyright (c) 2018 Vitaliy Manushkin <agri@akamo.info>.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "catch.hpp"
+
+#include <nlohmann/json.hpp>
+#include <string>
+#include <utility>
+
+/*
+ * This is virtually a string class.
+ * It covers std::string under the hood.
+ */
+class alt_string
+{
+ public:
+ using value_type = std::string::value_type;
+
+ alt_string(const char* str): str_impl(str) {}
+ alt_string(const char* str, std::size_t count): str_impl(str, count) {}
+ alt_string(size_t count, char chr): str_impl(count, chr) {}
+ alt_string() = default;
+
+ template <typename...TParams>
+ alt_string& append(TParams&& ...params)
+ {
+ str_impl.append(std::forward<TParams>(params)...);
+ return *this;
+ }
+
+ void push_back(char c)
+ {
+ str_impl.push_back(c);
+ }
+
+ template <typename op_type>
+ bool operator==(op_type&& op) const
+ {
+ return str_impl == op;
+ }
+
+ template <typename op_type>
+ bool operator!=(op_type&& op) const
+ {
+ return str_impl != op;
+ }
+
+ std::size_t size() const noexcept
+ {
+ return str_impl.size();
+ }
+
+ void resize (std::size_t n)
+ {
+ str_impl.resize(n);
+ }
+
+ void resize (std::size_t n, char c)
+ {
+ str_impl.resize(n, c);
+ }
+
+ template <typename op_type>
+ bool operator<(op_type&& op) const
+ {
+ return str_impl < op;
+ }
+
+ bool operator<(const alt_string& op) const
+ {
+ return str_impl < op.str_impl;
+ }
+
+ const char* c_str() const
+ {
+ return str_impl.c_str();
+ }
+
+ char& operator[](std::size_t index)
+ {
+ return str_impl[index];
+ }
+
+ const char& operator[](std::size_t index) const
+ {
+ return str_impl[index];
+ }
+
+ char& back()
+ {
+ return str_impl.back();
+ }
+
+ const char& back() const
+ {
+ return str_impl.back();
+ }
+
+ void clear()
+ {
+ str_impl.clear();
+ }
+
+ const value_type* data()
+ {
+ return str_impl.data();
+ }
+
+ private:
+ std::string str_impl;
+};
+
+
+using alt_json = nlohmann::basic_json <
+ std::map,
+ std::vector,
+ alt_string,
+ bool,
+ std::int64_t,
+ std::uint64_t,
+ double,
+ std::allocator,
+ nlohmann::adl_serializer >;
+
+
+
+TEST_CASE("alternative string type")
+{
+ SECTION("dump")
+ {
+ {
+ alt_json doc;
+ doc["pi"] = 3.141;
+ alt_string dump = doc.dump();
+ CHECK(dump == R"({"pi":3.141})");
+ }
+
+ {
+ alt_json doc;
+ doc["happy"] = true;
+ alt_string dump = doc.dump();
+ CHECK(dump == R"({"happy":true})");
+ }
+
+ {
+ alt_json doc;
+ doc["name"] = "I'm Batman";
+ alt_string dump = doc.dump();
+ CHECK(dump == R"({"name":"I'm Batman"})");
+ }
+
+ {
+ alt_json doc;
+ doc["nothing"] = nullptr;
+ alt_string dump = doc.dump();
+ CHECK(dump == R"({"nothing":null})");
+ }
+
+ {
+ alt_json doc;
+ doc["answer"]["everything"] = 42;
+ alt_string dump = doc.dump();
+ CHECK(dump == R"({"answer":{"everything":42}})");
+ }
+
+ {
+ alt_json doc;
+ doc["list"] = { 1, 0, 2 };
+ alt_string dump = doc.dump();
+ CHECK(dump == R"({"list":[1,0,2]})");
+ }
+
+ {
+ alt_json doc;
+ doc["list"] = { 1, 0, 2 };
+ alt_string dump = doc.dump();
+ CHECK(dump == R"({"list":[1,0,2]})");
+ }
+ }
+
+ SECTION("parse")
+ {
+ auto doc = alt_json::parse("{\"foo\": \"bar\"}");
+ alt_string dump = doc.dump();
+ CHECK(dump == R"({"foo":"bar"})");
+ }
+}