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Allow to use string_view from std::experimental #2364

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Allow to use string_view from std::experimental #2364

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fba2e9d
Temporary reduce test suite and force verbose build
karzhenkov Aug 21, 2020
df5943d
Temporary remove appveyor tests too
karzhenkov Aug 21, 2020
1943399
Fix C++ standard requirements for travis
karzhenkov Aug 21, 2020
5eddcc1
Allow to use string_view from std::experimental
karzhenkov Aug 21, 2020
5a0d8f4
Restore full test suite
karzhenkov Aug 21, 2020
f7f75c8
Exclude test with std::variant when it's unavailable
karzhenkov Aug 21, 2020
7b627c7
Use old emplace_back even with C++17
karzhenkov Aug 21, 2020
5f566f0
Synchronize single-header and basic variants of json.hpp
karzhenkov Aug 21, 2020
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10 changes: 8 additions & 2 deletions .travis.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -222,7 +222,7 @@ matrix:
compiler: gcc
env:
- COMPILER=g++-9
- CXXFLAGS=-std=c++2a
- CXX_STANDARD=17
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It would be better to specify CXX_STANDARD=20, however, cmake v3.9.2 at Travis doesn't support such option. Anyway, this setting had no effect before.

addons:
apt:
sources: ['ubuntu-toolchain-r-test']
Expand Down Expand Up @@ -306,7 +306,7 @@ matrix:
compiler: clang
env:
- COMPILER=clang++-7
- CXXFLAGS=-std=c++1z
- CXX_STANDARD=17
addons:
apt:
sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-7']
Expand All @@ -333,6 +333,12 @@ script:
# by default, use implicit conversions
- if [[ "${IMPLICIT_CONVERSIONS}" == "" ]]; then export IMPLICIT_CONVERSIONS=ON; fi

# append CXX_STANDARD to CMAKE_OPTIONS if required
- CMAKE_OPTIONS+=${CXX_STANDARD:+ -DCMAKE_CXX_STANDARD=$CXX_STANDARD -DCMAKE_CXX_STANDARD_REQUIRED=ON}

# force verbose build
- CMAKE_OPTIONS+=" -DCMAKE_VERBOSE_MAKEFILE=ON"

# compile and execute unit tests
- mkdir -p build && cd build
- cmake .. ${CMAKE_OPTIONS} -DJSON_MultipleHeaders=${MULTIPLE_HEADERS} -DJSON_ImplicitConversions=${IMPLICIT_CONVERSIONS} -DJSON_BuildTests=On -GNinja && cmake --build . --config Release
Expand Down
19 changes: 19 additions & 0 deletions include/nlohmann/detail/macro_scope.hpp
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Expand Up @@ -31,6 +31,25 @@
#define JSON_HAS_CPP_14
#endif

namespace nlohmann {
namespace std_aliases { }
using namespace std_aliases;
}

#if defined(JSON_HAS_CPP_17)
#if __has_include(<string_view>)
#include <string_view>
namespace nlohmann::std_aliases {
using std::string_view;
}
#elif __has_include(<experimental/string_view>)
#include <experimental/string_view>
namespace nlohmann::std_aliases {
using std::experimental::string_view;
}
#endif
#endif

// disable float-equal warnings on GCC/clang
#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)
#pragma GCC diagnostic push
Expand Down
2 changes: 1 addition & 1 deletion include/nlohmann/json.hpp
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Expand Up @@ -3230,7 +3230,7 @@ class basic_json
!detail::is_basic_json<ValueType>::value
&& !std::is_same<ValueType, std::initializer_list<typename string_t::value_type>>::value
#if defined(JSON_HAS_CPP_17) && (defined(__GNUC__) || (defined(_MSC_VER) && _MSC_VER >= 1910 && _MSC_VER <= 1914))
&& !std::is_same<ValueType, typename std::string_view>::value
&& !std::is_same<ValueType, string_view>::value
#endif
&& detail::is_detected<detail::get_template_function, const basic_json_t&, ValueType>::value
, int >::type = 0 >
Expand Down
21 changes: 20 additions & 1 deletion single_include/nlohmann/json.hpp
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Expand Up @@ -2048,6 +2048,25 @@ JSON_HEDLEY_DIAGNOSTIC_POP
#define JSON_HAS_CPP_14
#endif

namespace nlohmann {
namespace std_aliases { }
using namespace std_aliases;
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This introduces a mix of qualified and unqualified names in source code. E.g. we have std::string but string_view instead of std::string_view. We cannot introduce any names (such as std::expermental::string_view) directly into std. There is other option to consider:

namespace nlohmann {
    namespace std_aliases {
        using namespace std;
    }
}

This allows regular qualification approach (std_aliases::string and std_aliases::string_view) but requires a lots of changes in almost all files.

}

#if defined(JSON_HAS_CPP_17)
#if __has_include(<string_view>)
#include <string_view>
namespace nlohmann::std_aliases {
using std::string_view;
}
#elif __has_include(<experimental/string_view>)
#include <experimental/string_view>
namespace nlohmann::std_aliases {
using std::experimental::string_view;
}
#endif
#endif

// disable float-equal warnings on GCC/clang
#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)
#pragma GCC diagnostic push
Expand Down Expand Up @@ -19736,7 +19755,7 @@ class basic_json
!detail::is_basic_json<ValueType>::value
&& !std::is_same<ValueType, std::initializer_list<typename string_t::value_type>>::value
#if defined(JSON_HAS_CPP_17) && (defined(__GNUC__) || (defined(_MSC_VER) && _MSC_VER >= 1910 && _MSC_VER <= 1914))
&& !std::is_same<ValueType, typename std::string_view>::value
&& !std::is_same<ValueType, string_view>::value
#endif
&& detail::is_detected<detail::get_template_function, const basic_json_t&, ValueType>::value
, int >::type = 0 >
Expand Down
39 changes: 18 additions & 21 deletions test/src/unit-conversions.cpp
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Expand Up @@ -32,6 +32,7 @@ SOFTWARE.
#define JSON_TESTS_PRIVATE
#include <nlohmann/json.hpp>
using nlohmann::json;
using namespace nlohmann::std_aliases;

#include <deque>
#include <forward_list>
Expand All @@ -48,10 +49,6 @@ using nlohmann::json;
#define JSON_HAS_CPP_14
#endif

#if defined(JSON_HAS_CPP_17)
#include <string_view>
#endif

TEST_CASE("value conversion")
{
SECTION("get an object (explicit)")
Expand Down Expand Up @@ -465,7 +462,7 @@ TEST_CASE("value conversion")
#if defined(JSON_HAS_CPP_17)
SECTION("std::string_view")
{
std::string_view s = j.get<std::string_view>();
string_view s = j.get<string_view>();
CHECK(json(s) == j);
}
#endif
Expand Down Expand Up @@ -514,27 +511,27 @@ TEST_CASE("value conversion")
#if defined(JSON_HAS_CPP_17)
SECTION("exception in case of a non-string type using string_view")
{
CHECK_THROWS_AS(json(json::value_t::null).get<std::string_view>(), json::type_error&);
CHECK_THROWS_AS(json(json::value_t::object).get<std::string_view>(), json::type_error&);
CHECK_THROWS_AS(json(json::value_t::array).get<std::string_view>(), json::type_error&);
CHECK_THROWS_AS(json(json::value_t::boolean).get<std::string_view>(), json::type_error&);
CHECK_THROWS_AS(json(json::value_t::number_integer).get<std::string_view>(), json::type_error&);
CHECK_THROWS_AS(json(json::value_t::number_unsigned).get<std::string_view>(), json::type_error&);
CHECK_THROWS_AS(json(json::value_t::number_float).get<std::string_view>(), json::type_error&);
CHECK_THROWS_AS(json(json::value_t::null).get<string_view>(), json::type_error&);
CHECK_THROWS_AS(json(json::value_t::object).get<string_view>(), json::type_error&);
CHECK_THROWS_AS(json(json::value_t::array).get<string_view>(), json::type_error&);
CHECK_THROWS_AS(json(json::value_t::boolean).get<string_view>(), json::type_error&);
CHECK_THROWS_AS(json(json::value_t::number_integer).get<string_view>(), json::type_error&);
CHECK_THROWS_AS(json(json::value_t::number_unsigned).get<string_view>(), json::type_error&);
CHECK_THROWS_AS(json(json::value_t::number_float).get<string_view>(), json::type_error&);

CHECK_THROWS_WITH(json(json::value_t::null).get<std::string_view>(),
CHECK_THROWS_WITH(json(json::value_t::null).get<string_view>(),
"[json.exception.type_error.302] type must be string, but is null");
CHECK_THROWS_WITH(json(json::value_t::object).get<std::string_view>(),
CHECK_THROWS_WITH(json(json::value_t::object).get<string_view>(),
"[json.exception.type_error.302] type must be string, but is object");
CHECK_THROWS_WITH(json(json::value_t::array).get<std::string_view>(),
CHECK_THROWS_WITH(json(json::value_t::array).get<string_view>(),
"[json.exception.type_error.302] type must be string, but is array");
CHECK_THROWS_WITH(json(json::value_t::boolean).get<std::string_view>(),
CHECK_THROWS_WITH(json(json::value_t::boolean).get<string_view>(),
"[json.exception.type_error.302] type must be string, but is boolean");
CHECK_THROWS_WITH(json(json::value_t::number_integer).get<std::string_view>(),
CHECK_THROWS_WITH(json(json::value_t::number_integer).get<string_view>(),
"[json.exception.type_error.302] type must be string, but is number");
CHECK_THROWS_WITH(json(json::value_t::number_unsigned).get<std::string_view>(),
CHECK_THROWS_WITH(json(json::value_t::number_unsigned).get<string_view>(),
"[json.exception.type_error.302] type must be string, but is number");
CHECK_THROWS_WITH(json(json::value_t::number_float).get<std::string_view>(),
CHECK_THROWS_WITH(json(json::value_t::number_float).get<string_view>(),
"[json.exception.type_error.302] type must be string, but is number");
}
#endif
Expand Down Expand Up @@ -562,7 +559,7 @@ TEST_CASE("value conversion")
SECTION("std::string_view")
{
std::string s = "previous value";
std::string_view sv = s;
string_view sv = s;
j.get_to(sv);
CHECK(json(sv) == j);
}
Expand Down Expand Up @@ -617,7 +614,7 @@ TEST_CASE("value conversion")
#if defined(JSON_HAS_CPP_17)
SECTION("std::string_view")
{
std::string_view s = j.get<std::string_view>();
string_view s = j.get<string_view>();
CHECK(json(s) == j);
}
#endif
Expand Down