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/*
* Demonstrate which version of toString/StringMaker is being used
* for various types
*/
// Replace fallback stringifier for this TU
// We should avoid ODR violations because these specific types aren't
// present in different TUs
#include <string>
template <typename T>
std::string fallbackStringifier(T const&) {
return "{ !!! }";
}
#define CATCH_CONFIG_FALLBACK_STRINGIFIER fallbackStringifier
#include "catch.hpp"
#if defined(__GNUC__)
// This has to be left enabled until end of the TU, because the GCC
// frontend reports operator<<(std::ostream& os, const has_maker_and_operator&)
// as unused anyway
# pragma GCC diagnostic ignored "-Wunused-function"
#endif
namespace {
struct has_operator { };
struct has_maker {};
struct has_maker_and_operator {};
struct has_neither {};
struct has_template_operator {};
std::ostream& operator<<(std::ostream& os, const has_operator&) {
os << "operator<<( has_operator )";
return os;
}
std::ostream& operator<<(std::ostream& os, const has_maker_and_operator&) {
os << "operator<<( has_maker_and_operator )";
return os;
}
template <typename StreamT>
StreamT& operator<<(StreamT& os, const has_template_operator&) {
os << "operator<<( has_template_operator )";
return os;
}
} // end anonymous namespace
namespace Catch {
template<>
struct StringMaker<has_maker> {
static std::string convert( const has_maker& ) {
return "StringMaker<has_maker>";
}
};
template<>
struct StringMaker<has_maker_and_operator> {
static std::string convert( const has_maker_and_operator& ) {
return "StringMaker<has_maker_and_operator>";
}
};
}
// Call the operator
TEST_CASE( "stringify( has_operator )", "[toString]" ) {
has_operator item;
REQUIRE( ::Catch::Detail::stringify( item ) == "operator<<( has_operator )" );
}
// Call the stringmaker
TEST_CASE( "stringify( has_maker )", "[toString]" ) {
has_maker item;
REQUIRE( ::Catch::Detail::stringify( item ) == "StringMaker<has_maker>" );
}
// Call the stringmaker
TEST_CASE( "stringify( has_maker_and_operator )", "[toString]" ) {
has_maker_and_operator item;
REQUIRE( ::Catch::Detail::stringify( item ) == "StringMaker<has_maker_and_operator>" );
}
TEST_CASE("stringify( has_neither )", "[toString]") {
has_neither item;
REQUIRE( ::Catch::Detail::stringify(item) == "{ !!! }" );
}
// Call the templated operator
TEST_CASE( "stringify( has_template_operator )", "[toString]" ) {
has_template_operator item;
REQUIRE( ::Catch::Detail::stringify( item ) == "operator<<( has_template_operator )" );
}
// Vectors...
TEST_CASE( "stringify( vectors<has_operator> )", "[toString]" ) {
std::vector<has_operator> v(1);
REQUIRE( ::Catch::Detail::stringify( v ) == "{ operator<<( has_operator ) }" );
}
TEST_CASE( "stringify( vectors<has_maker> )", "[toString]" ) {
std::vector<has_maker> v(1);
REQUIRE( ::Catch::Detail::stringify( v ) == "{ StringMaker<has_maker> }" );
}
TEST_CASE( "stringify( vectors<has_maker_and_operator> )", "[toString]" ) {
std::vector<has_maker_and_operator> v(1);
REQUIRE( ::Catch::Detail::stringify( v ) == "{ StringMaker<has_maker_and_operator> }" );
}
namespace {
// Range-based conversion should only be used if other possibilities fail
struct int_iterator {
using iterator_category = std::input_iterator_tag;
using difference_type = std::ptrdiff_t;
using value_type = int;
using reference = int&;
using pointer = int*;
int_iterator() = default;
int_iterator(int i) :val(i) {}
value_type operator*() const { return val; }
bool operator==(int_iterator rhs) const { return val == rhs.val; }
bool operator!=(int_iterator rhs) const { return val != rhs.val; }
int_iterator operator++() { ++val; return *this; }
int_iterator operator++(int) {
auto temp(*this);
++val;
return temp;
}
private:
int val = 5;
};
struct streamable_range {
int_iterator begin() const { return int_iterator{ 1 }; }
int_iterator end() const { return {}; }
};
std::ostream& operator<<(std::ostream& os, const streamable_range&) {
os << "op<<(streamable_range)";
return os;
}
struct stringmaker_range {
int_iterator begin() const { return int_iterator{ 1 }; }
int_iterator end() const { return {}; }
};
} // end anonymous namespace
namespace Catch {
template <>
struct StringMaker<stringmaker_range> {
static std::string convert(stringmaker_range const&) {
return "stringmaker(streamable_range)";
}
};
}
namespace {
struct just_range {
int_iterator begin() const { return int_iterator{ 1 }; }
int_iterator end() const { return {}; }
};
struct disabled_range {
int_iterator begin() const { return int_iterator{ 1 }; }
int_iterator end() const { return {}; }
};
} // end anonymous namespace
namespace Catch {
template <>
struct is_range<disabled_range> {
static const bool value = false;
};
}
TEST_CASE("stringify ranges", "[toString]") {
REQUIRE(::Catch::Detail::stringify(streamable_range{}) == "op<<(streamable_range)");
REQUIRE(::Catch::Detail::stringify(stringmaker_range{}) == "stringmaker(streamable_range)");
REQUIRE(::Catch::Detail::stringify(just_range{}) == "{ 1, 2, 3, 4 }");
REQUIRE(::Catch::Detail::stringify(disabled_range{}) == "{ !!! }");
}
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