[LyX/master] Use `to_string` instead of `boost::lexical_cast`

[Yuriy Skalko]

commit 9348c5c63521d5e2908e30b191afb1e703ff219a
Author: Yuriy Skalko <yuriy.skalko at gmail.com>
Date:   Thu Dec 10 14:33:47 2020 +0200

    Use `to_string` instead of `boost::lexical_cast`
---
 src/support/convert.cpp |   51 ++++++++++++++--------------------------------
 1 files changed, 16 insertions(+), 35 deletions(-)

diff --git a/src/support/convert.cpp b/src/support/convert.cpp
index 5912ac5..7053be3 100644
--- a/src/support/convert.cpp
+++ b/src/support/convert.cpp
@@ -14,8 +14,6 @@
 #include "support/convert.h"
 #include "support/docstring.h"
 
-#include <boost/lexical_cast.hpp>
-
 #include <string>
 #include <sstream>
 //needed for Mac OSX 10.5.2 Leopard
@@ -23,23 +21,6 @@
 
 using namespace std;
 
-namespace {
-
-// A version of lexical cast that does not throw. Useful for when we convert to string
-template<typename To, typename From>
-To lexical_cast(From const & value, To const & defaultResult = To())
-{
-	try {
-		return boost::lexical_cast<To>(value);
-	} catch(...) {
-		// Ignore all exceptions and use default.
-		return defaultResult;
-	}
-}
-
-} // namespace
-
-
 namespace lyx {
 
 template<>
@@ -59,49 +40,49 @@ string convert<string>(char c)
 template<>
 string convert<string>(short unsigned int sui)
 {
-	return lexical_cast<string>(sui);
+	return to_string(sui);
 }
 
 
 template<>
 string convert<string>(int i)
 {
-	return lexical_cast<string>(i);
+	return to_string(i);
 }
 
 
 template<>
 docstring convert<docstring>(int i)
 {
-	return from_ascii(lexical_cast<string>(i));
+	return from_ascii(to_string(i));
 }
 
 
 template<>
 string convert<string>(unsigned int ui)
 {
-	return lexical_cast<string>(ui);
+	return to_string(ui);
 }
 
 
 template<>
 docstring convert<docstring>(unsigned int ui)
 {
-	return from_ascii(lexical_cast<string>(ui));
+	return from_ascii(to_string(ui));
 }
 
 
 template<>
 string convert<string>(unsigned long ul)
 {
-	return lexical_cast<string>(ul);
+	return to_string(ul);
 }
 
 
 template<>
 docstring convert<docstring>(unsigned long ul)
 {
-	return from_ascii(lexical_cast<string>(ul));
+	return from_ascii(to_string(ul));
 }
 
 
@@ -109,28 +90,28 @@ docstring convert<docstring>(unsigned long ul)
 template<>
 string convert<string>(unsigned long long ull)
 {
-	return lexical_cast<string>(ull);
+	return to_string(ull);
 }
 
 
 template<>
 docstring convert<docstring>(unsigned long long ull)
 {
-	return from_ascii(lexical_cast<string>(ull));
+	return from_ascii(to_string(ull));
 }
 
 
 template<>
 string convert<string>(long long ll)
 {
-	return lexical_cast<string>(ll);
+	return to_string(ll);
 }
 
 
 template<>
 docstring convert<docstring>(long long ll)
 {
-	return from_ascii(lexical_cast<string>(ll));
+	return from_ascii(to_string(ll));
 }
 
 
@@ -154,21 +135,21 @@ long long convert<long long>(string const s)
 template<>
 string convert<string>(long l)
 {
-	return lexical_cast<string>(l);
+	return to_string(l);
 }
 
 
 template<>
 docstring convert<docstring>(long l)
 {
-	return from_ascii(lexical_cast<string>(l));
+	return from_ascii(to_string(l));
 }
 
 
 template<>
 string convert<string>(float f)
 {
-	std::ostringstream val;
+	ostringstream val;
 	val << f;
 	return val.str();
 }
@@ -177,7 +158,7 @@ string convert<string>(float f)
 template<>
 string convert<string>(double d)
 {
-	std::ostringstream val;
+	ostringstream val;
 	val << d;
 	return val.str();
 }
@@ -197,7 +178,7 @@ int convert<int>(string const s)
 }
 
 
-int convert(std::string const & s, int base)
+int convert(string const & s, int base)
 {
 	return int(strtol(s.c_str(), nullptr, base));
 }